IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.167.168.0/21

network10.167.168.0/21

broadcast10.167.175.255

first host10.167.168.1

last host10.167.175.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.167.168.0/21

address00001010.10100111.10101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.10100111.10101000.00000000

broadcast00001010.10100111.10101111.11111111

green = network part, grey = host part

hex0x0aa7a800

decimal178759680

reverse dns0.168.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:a800

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.167.168.0/29	10.167.168.1 – 10.167.168.6	10.167.168.7
2	10.167.168.8/29	10.167.168.9 – 10.167.168.14	10.167.168.15
3	10.167.168.16/29	10.167.168.17 – 10.167.168.22	10.167.168.23
4	10.167.168.24/29	10.167.168.25 – 10.167.168.30	10.167.168.31
5	10.167.168.32/29	10.167.168.33 – 10.167.168.38	10.167.168.39
6	10.167.168.40/29	10.167.168.41 – 10.167.168.46	10.167.168.47
7	10.167.168.48/29	10.167.168.49 – 10.167.168.54	10.167.168.55
8	10.167.168.56/29	10.167.168.57 – 10.167.168.62	10.167.168.63
9	10.167.168.64/29	10.167.168.65 – 10.167.168.70	10.167.168.71
10	10.167.168.72/29	10.167.168.73 – 10.167.168.78	10.167.168.79
11	10.167.168.80/29	10.167.168.81 – 10.167.168.86	10.167.168.87
12	10.167.168.88/29	10.167.168.89 – 10.167.168.94	10.167.168.95
13	10.167.168.96/29	10.167.168.97 – 10.167.168.102	10.167.168.103
14	10.167.168.104/29	10.167.168.105 – 10.167.168.110	10.167.168.111
15	10.167.168.112/29	10.167.168.113 – 10.167.168.118	10.167.168.119
16	10.167.168.120/29	10.167.168.121 – 10.167.168.126	10.167.168.127
17	10.167.168.128/29	10.167.168.129 – 10.167.168.134	10.167.168.135
18	10.167.168.136/29	10.167.168.137 – 10.167.168.142	10.167.168.143
19	10.167.168.144/29	10.167.168.145 – 10.167.168.150	10.167.168.151
20	10.167.168.152/29	10.167.168.153 – 10.167.168.158	10.167.168.159
21	10.167.168.160/29	10.167.168.161 – 10.167.168.166	10.167.168.167
22	10.167.168.168/29	10.167.168.169 – 10.167.168.174	10.167.168.175
23	10.167.168.176/29	10.167.168.177 – 10.167.168.182	10.167.168.183
24	10.167.168.184/29	10.167.168.185 – 10.167.168.190	10.167.168.191
25	10.167.168.192/29	10.167.168.193 – 10.167.168.198	10.167.168.199
26	10.167.168.200/29	10.167.168.201 – 10.167.168.206	10.167.168.207
27	10.167.168.208/29	10.167.168.209 – 10.167.168.214	10.167.168.215
28	10.167.168.216/29	10.167.168.217 – 10.167.168.222	10.167.168.223
29	10.167.168.224/29	10.167.168.225 – 10.167.168.230	10.167.168.231
30	10.167.168.232/29	10.167.168.233 – 10.167.168.238	10.167.168.239
31	10.167.168.240/29	10.167.168.241 – 10.167.168.246	10.167.168.247
32	10.167.168.248/29	10.167.168.249 – 10.167.168.254	10.167.168.255
33	10.167.169.0/29	10.167.169.1 – 10.167.169.6	10.167.169.7
34	10.167.169.8/29	10.167.169.9 – 10.167.169.14	10.167.169.15
35	10.167.169.16/29	10.167.169.17 – 10.167.169.22	10.167.169.23
36	10.167.169.24/29	10.167.169.25 – 10.167.169.30	10.167.169.31
37	10.167.169.32/29	10.167.169.33 – 10.167.169.38	10.167.169.39
38	10.167.169.40/29	10.167.169.41 – 10.167.169.46	10.167.169.47
39	10.167.169.48/29	10.167.169.49 – 10.167.169.54	10.167.169.55
40	10.167.169.56/29	10.167.169.57 – 10.167.169.62	10.167.169.63
41	10.167.169.64/29	10.167.169.65 – 10.167.169.70	10.167.169.71
42	10.167.169.72/29	10.167.169.73 – 10.167.169.78	10.167.169.79
43	10.167.169.80/29	10.167.169.81 – 10.167.169.86	10.167.169.87
44	10.167.169.88/29	10.167.169.89 – 10.167.169.94	10.167.169.95
45	10.167.169.96/29	10.167.169.97 – 10.167.169.102	10.167.169.103
46	10.167.169.104/29	10.167.169.105 – 10.167.169.110	10.167.169.111
47	10.167.169.112/29	10.167.169.113 – 10.167.169.118	10.167.169.119
48	10.167.169.120/29	10.167.169.121 – 10.167.169.126	10.167.169.127
49	10.167.169.128/29	10.167.169.129 – 10.167.169.134	10.167.169.135
50	10.167.169.136/29	10.167.169.137 – 10.167.169.142	10.167.169.143
51	10.167.169.144/29	10.167.169.145 – 10.167.169.150	10.167.169.151
52	10.167.169.152/29	10.167.169.153 – 10.167.169.158	10.167.169.159
53	10.167.169.160/29	10.167.169.161 – 10.167.169.166	10.167.169.167
54	10.167.169.168/29	10.167.169.169 – 10.167.169.174	10.167.169.175
55	10.167.169.176/29	10.167.169.177 – 10.167.169.182	10.167.169.183
56	10.167.169.184/29	10.167.169.185 – 10.167.169.190	10.167.169.191
57	10.167.169.192/29	10.167.169.193 – 10.167.169.198	10.167.169.199
58	10.167.169.200/29	10.167.169.201 – 10.167.169.206	10.167.169.207
59	10.167.169.208/29	10.167.169.209 – 10.167.169.214	10.167.169.215
60	10.167.169.216/29	10.167.169.217 – 10.167.169.222	10.167.169.223
61	10.167.169.224/29	10.167.169.225 – 10.167.169.230	10.167.169.231
62	10.167.169.232/29	10.167.169.233 – 10.167.169.238	10.167.169.239
63	10.167.169.240/29	10.167.169.241 – 10.167.169.246	10.167.169.247
64	10.167.169.248/29	10.167.169.249 – 10.167.169.254	10.167.169.255
65	10.167.170.0/29	10.167.170.1 – 10.167.170.6	10.167.170.7
66	10.167.170.8/29	10.167.170.9 – 10.167.170.14	10.167.170.15
67	10.167.170.16/29	10.167.170.17 – 10.167.170.22	10.167.170.23
68	10.167.170.24/29	10.167.170.25 – 10.167.170.30	10.167.170.31
69	10.167.170.32/29	10.167.170.33 – 10.167.170.38	10.167.170.39
70	10.167.170.40/29	10.167.170.41 – 10.167.170.46	10.167.170.47
71	10.167.170.48/29	10.167.170.49 – 10.167.170.54	10.167.170.55
72	10.167.170.56/29	10.167.170.57 – 10.167.170.62	10.167.170.63
73	10.167.170.64/29	10.167.170.65 – 10.167.170.70	10.167.170.71
74	10.167.170.72/29	10.167.170.73 – 10.167.170.78	10.167.170.79
75	10.167.170.80/29	10.167.170.81 – 10.167.170.86	10.167.170.87
76	10.167.170.88/29	10.167.170.89 – 10.167.170.94	10.167.170.95
77	10.167.170.96/29	10.167.170.97 – 10.167.170.102	10.167.170.103
78	10.167.170.104/29	10.167.170.105 – 10.167.170.110	10.167.170.111
79	10.167.170.112/29	10.167.170.113 – 10.167.170.118	10.167.170.119
80	10.167.170.120/29	10.167.170.121 – 10.167.170.126	10.167.170.127
81	10.167.170.128/29	10.167.170.129 – 10.167.170.134	10.167.170.135
82	10.167.170.136/29	10.167.170.137 – 10.167.170.142	10.167.170.143
83	10.167.170.144/29	10.167.170.145 – 10.167.170.150	10.167.170.151
84	10.167.170.152/29	10.167.170.153 – 10.167.170.158	10.167.170.159
85	10.167.170.160/29	10.167.170.161 – 10.167.170.166	10.167.170.167
86	10.167.170.168/29	10.167.170.169 – 10.167.170.174	10.167.170.175
87	10.167.170.176/29	10.167.170.177 – 10.167.170.182	10.167.170.183
88	10.167.170.184/29	10.167.170.185 – 10.167.170.190	10.167.170.191
89	10.167.170.192/29	10.167.170.193 – 10.167.170.198	10.167.170.199
90	10.167.170.200/29	10.167.170.201 – 10.167.170.206	10.167.170.207
91	10.167.170.208/29	10.167.170.209 – 10.167.170.214	10.167.170.215
92	10.167.170.216/29	10.167.170.217 – 10.167.170.222	10.167.170.223
93	10.167.170.224/29	10.167.170.225 – 10.167.170.230	10.167.170.231
94	10.167.170.232/29	10.167.170.233 – 10.167.170.238	10.167.170.239
95	10.167.170.240/29	10.167.170.241 – 10.167.170.246	10.167.170.247
96	10.167.170.248/29	10.167.170.249 – 10.167.170.254	10.167.170.255
97	10.167.171.0/29	10.167.171.1 – 10.167.171.6	10.167.171.7
98	10.167.171.8/29	10.167.171.9 – 10.167.171.14	10.167.171.15
99	10.167.171.16/29	10.167.171.17 – 10.167.171.22	10.167.171.23
100	10.167.171.24/29	10.167.171.25 – 10.167.171.30	10.167.171.31
101	10.167.171.32/29	10.167.171.33 – 10.167.171.38	10.167.171.39
102	10.167.171.40/29	10.167.171.41 – 10.167.171.46	10.167.171.47
103	10.167.171.48/29	10.167.171.49 – 10.167.171.54	10.167.171.55
104	10.167.171.56/29	10.167.171.57 – 10.167.171.62	10.167.171.63
105	10.167.171.64/29	10.167.171.65 – 10.167.171.70	10.167.171.71
106	10.167.171.72/29	10.167.171.73 – 10.167.171.78	10.167.171.79
107	10.167.171.80/29	10.167.171.81 – 10.167.171.86	10.167.171.87
108	10.167.171.88/29	10.167.171.89 – 10.167.171.94	10.167.171.95
109	10.167.171.96/29	10.167.171.97 – 10.167.171.102	10.167.171.103
110	10.167.171.104/29	10.167.171.105 – 10.167.171.110	10.167.171.111
111	10.167.171.112/29	10.167.171.113 – 10.167.171.118	10.167.171.119
112	10.167.171.120/29	10.167.171.121 – 10.167.171.126	10.167.171.127
113	10.167.171.128/29	10.167.171.129 – 10.167.171.134	10.167.171.135
114	10.167.171.136/29	10.167.171.137 – 10.167.171.142	10.167.171.143
115	10.167.171.144/29	10.167.171.145 – 10.167.171.150	10.167.171.151
116	10.167.171.152/29	10.167.171.153 – 10.167.171.158	10.167.171.159
117	10.167.171.160/29	10.167.171.161 – 10.167.171.166	10.167.171.167
118	10.167.171.168/29	10.167.171.169 – 10.167.171.174	10.167.171.175
119	10.167.171.176/29	10.167.171.177 – 10.167.171.182	10.167.171.183
120	10.167.171.184/29	10.167.171.185 – 10.167.171.190	10.167.171.191
121	10.167.171.192/29	10.167.171.193 – 10.167.171.198	10.167.171.199
122	10.167.171.200/29	10.167.171.201 – 10.167.171.206	10.167.171.207
123	10.167.171.208/29	10.167.171.209 – 10.167.171.214	10.167.171.215
124	10.167.171.216/29	10.167.171.217 – 10.167.171.222	10.167.171.223
125	10.167.171.224/29	10.167.171.225 – 10.167.171.230	10.167.171.231
126	10.167.171.232/29	10.167.171.233 – 10.167.171.238	10.167.171.239
127	10.167.171.240/29	10.167.171.241 – 10.167.171.246	10.167.171.247
128	10.167.171.248/29	10.167.171.249 – 10.167.171.254	10.167.171.255
129	10.167.172.0/29	10.167.172.1 – 10.167.172.6	10.167.172.7
130	10.167.172.8/29	10.167.172.9 – 10.167.172.14	10.167.172.15
131	10.167.172.16/29	10.167.172.17 – 10.167.172.22	10.167.172.23
132	10.167.172.24/29	10.167.172.25 – 10.167.172.30	10.167.172.31
133	10.167.172.32/29	10.167.172.33 – 10.167.172.38	10.167.172.39
134	10.167.172.40/29	10.167.172.41 – 10.167.172.46	10.167.172.47
135	10.167.172.48/29	10.167.172.49 – 10.167.172.54	10.167.172.55
136	10.167.172.56/29	10.167.172.57 – 10.167.172.62	10.167.172.63
137	10.167.172.64/29	10.167.172.65 – 10.167.172.70	10.167.172.71
138	10.167.172.72/29	10.167.172.73 – 10.167.172.78	10.167.172.79
139	10.167.172.80/29	10.167.172.81 – 10.167.172.86	10.167.172.87
140	10.167.172.88/29	10.167.172.89 – 10.167.172.94	10.167.172.95
141	10.167.172.96/29	10.167.172.97 – 10.167.172.102	10.167.172.103
142	10.167.172.104/29	10.167.172.105 – 10.167.172.110	10.167.172.111
143	10.167.172.112/29	10.167.172.113 – 10.167.172.118	10.167.172.119
144	10.167.172.120/29	10.167.172.121 – 10.167.172.126	10.167.172.127
145	10.167.172.128/29	10.167.172.129 – 10.167.172.134	10.167.172.135
146	10.167.172.136/29	10.167.172.137 – 10.167.172.142	10.167.172.143
147	10.167.172.144/29	10.167.172.145 – 10.167.172.150	10.167.172.151
148	10.167.172.152/29	10.167.172.153 – 10.167.172.158	10.167.172.159
149	10.167.172.160/29	10.167.172.161 – 10.167.172.166	10.167.172.167
150	10.167.172.168/29	10.167.172.169 – 10.167.172.174	10.167.172.175
151	10.167.172.176/29	10.167.172.177 – 10.167.172.182	10.167.172.183
152	10.167.172.184/29	10.167.172.185 – 10.167.172.190	10.167.172.191
153	10.167.172.192/29	10.167.172.193 – 10.167.172.198	10.167.172.199
154	10.167.172.200/29	10.167.172.201 – 10.167.172.206	10.167.172.207
155	10.167.172.208/29	10.167.172.209 – 10.167.172.214	10.167.172.215
156	10.167.172.216/29	10.167.172.217 – 10.167.172.222	10.167.172.223
157	10.167.172.224/29	10.167.172.225 – 10.167.172.230	10.167.172.231
158	10.167.172.232/29	10.167.172.233 – 10.167.172.238	10.167.172.239
159	10.167.172.240/29	10.167.172.241 – 10.167.172.246	10.167.172.247
160	10.167.172.248/29	10.167.172.249 – 10.167.172.254	10.167.172.255
161	10.167.173.0/29	10.167.173.1 – 10.167.173.6	10.167.173.7
162	10.167.173.8/29	10.167.173.9 – 10.167.173.14	10.167.173.15
163	10.167.173.16/29	10.167.173.17 – 10.167.173.22	10.167.173.23
164	10.167.173.24/29	10.167.173.25 – 10.167.173.30	10.167.173.31
165	10.167.173.32/29	10.167.173.33 – 10.167.173.38	10.167.173.39
166	10.167.173.40/29	10.167.173.41 – 10.167.173.46	10.167.173.47
167	10.167.173.48/29	10.167.173.49 – 10.167.173.54	10.167.173.55
168	10.167.173.56/29	10.167.173.57 – 10.167.173.62	10.167.173.63
169	10.167.173.64/29	10.167.173.65 – 10.167.173.70	10.167.173.71
170	10.167.173.72/29	10.167.173.73 – 10.167.173.78	10.167.173.79
171	10.167.173.80/29	10.167.173.81 – 10.167.173.86	10.167.173.87
172	10.167.173.88/29	10.167.173.89 – 10.167.173.94	10.167.173.95
173	10.167.173.96/29	10.167.173.97 – 10.167.173.102	10.167.173.103
174	10.167.173.104/29	10.167.173.105 – 10.167.173.110	10.167.173.111
175	10.167.173.112/29	10.167.173.113 – 10.167.173.118	10.167.173.119
176	10.167.173.120/29	10.167.173.121 – 10.167.173.126	10.167.173.127
177	10.167.173.128/29	10.167.173.129 – 10.167.173.134	10.167.173.135
178	10.167.173.136/29	10.167.173.137 – 10.167.173.142	10.167.173.143
179	10.167.173.144/29	10.167.173.145 – 10.167.173.150	10.167.173.151
180	10.167.173.152/29	10.167.173.153 – 10.167.173.158	10.167.173.159
181	10.167.173.160/29	10.167.173.161 – 10.167.173.166	10.167.173.167
182	10.167.173.168/29	10.167.173.169 – 10.167.173.174	10.167.173.175
183	10.167.173.176/29	10.167.173.177 – 10.167.173.182	10.167.173.183
184	10.167.173.184/29	10.167.173.185 – 10.167.173.190	10.167.173.191
185	10.167.173.192/29	10.167.173.193 – 10.167.173.198	10.167.173.199
186	10.167.173.200/29	10.167.173.201 – 10.167.173.206	10.167.173.207
187	10.167.173.208/29	10.167.173.209 – 10.167.173.214	10.167.173.215
188	10.167.173.216/29	10.167.173.217 – 10.167.173.222	10.167.173.223
189	10.167.173.224/29	10.167.173.225 – 10.167.173.230	10.167.173.231
190	10.167.173.232/29	10.167.173.233 – 10.167.173.238	10.167.173.239
191	10.167.173.240/29	10.167.173.241 – 10.167.173.246	10.167.173.247
192	10.167.173.248/29	10.167.173.249 – 10.167.173.254	10.167.173.255
193	10.167.174.0/29	10.167.174.1 – 10.167.174.6	10.167.174.7
194	10.167.174.8/29	10.167.174.9 – 10.167.174.14	10.167.174.15
195	10.167.174.16/29	10.167.174.17 – 10.167.174.22	10.167.174.23
196	10.167.174.24/29	10.167.174.25 – 10.167.174.30	10.167.174.31
197	10.167.174.32/29	10.167.174.33 – 10.167.174.38	10.167.174.39
198	10.167.174.40/29	10.167.174.41 – 10.167.174.46	10.167.174.47
199	10.167.174.48/29	10.167.174.49 – 10.167.174.54	10.167.174.55
200	10.167.174.56/29	10.167.174.57 – 10.167.174.62	10.167.174.63
201	10.167.174.64/29	10.167.174.65 – 10.167.174.70	10.167.174.71
202	10.167.174.72/29	10.167.174.73 – 10.167.174.78	10.167.174.79
203	10.167.174.80/29	10.167.174.81 – 10.167.174.86	10.167.174.87
204	10.167.174.88/29	10.167.174.89 – 10.167.174.94	10.167.174.95
205	10.167.174.96/29	10.167.174.97 – 10.167.174.102	10.167.174.103
206	10.167.174.104/29	10.167.174.105 – 10.167.174.110	10.167.174.111
207	10.167.174.112/29	10.167.174.113 – 10.167.174.118	10.167.174.119
208	10.167.174.120/29	10.167.174.121 – 10.167.174.126	10.167.174.127
209	10.167.174.128/29	10.167.174.129 – 10.167.174.134	10.167.174.135
210	10.167.174.136/29	10.167.174.137 – 10.167.174.142	10.167.174.143
211	10.167.174.144/29	10.167.174.145 – 10.167.174.150	10.167.174.151
212	10.167.174.152/29	10.167.174.153 – 10.167.174.158	10.167.174.159
213	10.167.174.160/29	10.167.174.161 – 10.167.174.166	10.167.174.167
214	10.167.174.168/29	10.167.174.169 – 10.167.174.174	10.167.174.175
215	10.167.174.176/29	10.167.174.177 – 10.167.174.182	10.167.174.183
216	10.167.174.184/29	10.167.174.185 – 10.167.174.190	10.167.174.191
217	10.167.174.192/29	10.167.174.193 – 10.167.174.198	10.167.174.199
218	10.167.174.200/29	10.167.174.201 – 10.167.174.206	10.167.174.207
219	10.167.174.208/29	10.167.174.209 – 10.167.174.214	10.167.174.215
220	10.167.174.216/29	10.167.174.217 – 10.167.174.222	10.167.174.223
221	10.167.174.224/29	10.167.174.225 – 10.167.174.230	10.167.174.231
222	10.167.174.232/29	10.167.174.233 – 10.167.174.238	10.167.174.239
223	10.167.174.240/29	10.167.174.241 – 10.167.174.246	10.167.174.247
224	10.167.174.248/29	10.167.174.249 – 10.167.174.254	10.167.174.255
225	10.167.175.0/29	10.167.175.1 – 10.167.175.6	10.167.175.7
226	10.167.175.8/29	10.167.175.9 – 10.167.175.14	10.167.175.15
227	10.167.175.16/29	10.167.175.17 – 10.167.175.22	10.167.175.23
228	10.167.175.24/29	10.167.175.25 – 10.167.175.30	10.167.175.31
229	10.167.175.32/29	10.167.175.33 – 10.167.175.38	10.167.175.39
230	10.167.175.40/29	10.167.175.41 – 10.167.175.46	10.167.175.47
231	10.167.175.48/29	10.167.175.49 – 10.167.175.54	10.167.175.55
232	10.167.175.56/29	10.167.175.57 – 10.167.175.62	10.167.175.63
233	10.167.175.64/29	10.167.175.65 – 10.167.175.70	10.167.175.71
234	10.167.175.72/29	10.167.175.73 – 10.167.175.78	10.167.175.79
235	10.167.175.80/29	10.167.175.81 – 10.167.175.86	10.167.175.87
236	10.167.175.88/29	10.167.175.89 – 10.167.175.94	10.167.175.95
237	10.167.175.96/29	10.167.175.97 – 10.167.175.102	10.167.175.103
238	10.167.175.104/29	10.167.175.105 – 10.167.175.110	10.167.175.111
239	10.167.175.112/29	10.167.175.113 – 10.167.175.118	10.167.175.119
240	10.167.175.120/29	10.167.175.121 – 10.167.175.126	10.167.175.127
241	10.167.175.128/29	10.167.175.129 – 10.167.175.134	10.167.175.135
242	10.167.175.136/29	10.167.175.137 – 10.167.175.142	10.167.175.143
243	10.167.175.144/29	10.167.175.145 – 10.167.175.150	10.167.175.151
244	10.167.175.152/29	10.167.175.153 – 10.167.175.158	10.167.175.159
245	10.167.175.160/29	10.167.175.161 – 10.167.175.166	10.167.175.167
246	10.167.175.168/29	10.167.175.169 – 10.167.175.174	10.167.175.175
247	10.167.175.176/29	10.167.175.177 – 10.167.175.182	10.167.175.183
248	10.167.175.184/29	10.167.175.185 – 10.167.175.190	10.167.175.191
249	10.167.175.192/29	10.167.175.193 – 10.167.175.198	10.167.175.199
250	10.167.175.200/29	10.167.175.201 – 10.167.175.206	10.167.175.207
251	10.167.175.208/29	10.167.175.209 – 10.167.175.214	10.167.175.215
252	10.167.175.216/29	10.167.175.217 – 10.167.175.222	10.167.175.223
253	10.167.175.224/29	10.167.175.225 – 10.167.175.230	10.167.175.231
254	10.167.175.232/29	10.167.175.233 – 10.167.175.238	10.167.175.239
255	10.167.175.240/29	10.167.175.241 – 10.167.175.246	10.167.175.247
256	10.167.175.248/29	10.167.175.249 – 10.167.175.254	10.167.175.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /21
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →