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)10.3.160.0/21

network10.3.160.0/21

broadcast10.3.167.255

first host10.3.160.1

last host10.3.167.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.160.0/21

address00001010.00000011.10100000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.10100000.00000000

broadcast00001010.00000011.10100111.11111111

green = network part, grey = host part

hex0x0a03a000

decimal168009728

reverse dns0.160.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:a000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.3.160.0/29	10.3.160.1 – 10.3.160.6	10.3.160.7
2	10.3.160.8/29	10.3.160.9 – 10.3.160.14	10.3.160.15
3	10.3.160.16/29	10.3.160.17 – 10.3.160.22	10.3.160.23
4	10.3.160.24/29	10.3.160.25 – 10.3.160.30	10.3.160.31
5	10.3.160.32/29	10.3.160.33 – 10.3.160.38	10.3.160.39
6	10.3.160.40/29	10.3.160.41 – 10.3.160.46	10.3.160.47
7	10.3.160.48/29	10.3.160.49 – 10.3.160.54	10.3.160.55
8	10.3.160.56/29	10.3.160.57 – 10.3.160.62	10.3.160.63
9	10.3.160.64/29	10.3.160.65 – 10.3.160.70	10.3.160.71
10	10.3.160.72/29	10.3.160.73 – 10.3.160.78	10.3.160.79
11	10.3.160.80/29	10.3.160.81 – 10.3.160.86	10.3.160.87
12	10.3.160.88/29	10.3.160.89 – 10.3.160.94	10.3.160.95
13	10.3.160.96/29	10.3.160.97 – 10.3.160.102	10.3.160.103
14	10.3.160.104/29	10.3.160.105 – 10.3.160.110	10.3.160.111
15	10.3.160.112/29	10.3.160.113 – 10.3.160.118	10.3.160.119
16	10.3.160.120/29	10.3.160.121 – 10.3.160.126	10.3.160.127
17	10.3.160.128/29	10.3.160.129 – 10.3.160.134	10.3.160.135
18	10.3.160.136/29	10.3.160.137 – 10.3.160.142	10.3.160.143
19	10.3.160.144/29	10.3.160.145 – 10.3.160.150	10.3.160.151
20	10.3.160.152/29	10.3.160.153 – 10.3.160.158	10.3.160.159
21	10.3.160.160/29	10.3.160.161 – 10.3.160.166	10.3.160.167
22	10.3.160.168/29	10.3.160.169 – 10.3.160.174	10.3.160.175
23	10.3.160.176/29	10.3.160.177 – 10.3.160.182	10.3.160.183
24	10.3.160.184/29	10.3.160.185 – 10.3.160.190	10.3.160.191
25	10.3.160.192/29	10.3.160.193 – 10.3.160.198	10.3.160.199
26	10.3.160.200/29	10.3.160.201 – 10.3.160.206	10.3.160.207
27	10.3.160.208/29	10.3.160.209 – 10.3.160.214	10.3.160.215
28	10.3.160.216/29	10.3.160.217 – 10.3.160.222	10.3.160.223
29	10.3.160.224/29	10.3.160.225 – 10.3.160.230	10.3.160.231
30	10.3.160.232/29	10.3.160.233 – 10.3.160.238	10.3.160.239
31	10.3.160.240/29	10.3.160.241 – 10.3.160.246	10.3.160.247
32	10.3.160.248/29	10.3.160.249 – 10.3.160.254	10.3.160.255
33	10.3.161.0/29	10.3.161.1 – 10.3.161.6	10.3.161.7
34	10.3.161.8/29	10.3.161.9 – 10.3.161.14	10.3.161.15
35	10.3.161.16/29	10.3.161.17 – 10.3.161.22	10.3.161.23
36	10.3.161.24/29	10.3.161.25 – 10.3.161.30	10.3.161.31
37	10.3.161.32/29	10.3.161.33 – 10.3.161.38	10.3.161.39
38	10.3.161.40/29	10.3.161.41 – 10.3.161.46	10.3.161.47
39	10.3.161.48/29	10.3.161.49 – 10.3.161.54	10.3.161.55
40	10.3.161.56/29	10.3.161.57 – 10.3.161.62	10.3.161.63
41	10.3.161.64/29	10.3.161.65 – 10.3.161.70	10.3.161.71
42	10.3.161.72/29	10.3.161.73 – 10.3.161.78	10.3.161.79
43	10.3.161.80/29	10.3.161.81 – 10.3.161.86	10.3.161.87
44	10.3.161.88/29	10.3.161.89 – 10.3.161.94	10.3.161.95
45	10.3.161.96/29	10.3.161.97 – 10.3.161.102	10.3.161.103
46	10.3.161.104/29	10.3.161.105 – 10.3.161.110	10.3.161.111
47	10.3.161.112/29	10.3.161.113 – 10.3.161.118	10.3.161.119
48	10.3.161.120/29	10.3.161.121 – 10.3.161.126	10.3.161.127
49	10.3.161.128/29	10.3.161.129 – 10.3.161.134	10.3.161.135
50	10.3.161.136/29	10.3.161.137 – 10.3.161.142	10.3.161.143
51	10.3.161.144/29	10.3.161.145 – 10.3.161.150	10.3.161.151
52	10.3.161.152/29	10.3.161.153 – 10.3.161.158	10.3.161.159
53	10.3.161.160/29	10.3.161.161 – 10.3.161.166	10.3.161.167
54	10.3.161.168/29	10.3.161.169 – 10.3.161.174	10.3.161.175
55	10.3.161.176/29	10.3.161.177 – 10.3.161.182	10.3.161.183
56	10.3.161.184/29	10.3.161.185 – 10.3.161.190	10.3.161.191
57	10.3.161.192/29	10.3.161.193 – 10.3.161.198	10.3.161.199
58	10.3.161.200/29	10.3.161.201 – 10.3.161.206	10.3.161.207
59	10.3.161.208/29	10.3.161.209 – 10.3.161.214	10.3.161.215
60	10.3.161.216/29	10.3.161.217 – 10.3.161.222	10.3.161.223
61	10.3.161.224/29	10.3.161.225 – 10.3.161.230	10.3.161.231
62	10.3.161.232/29	10.3.161.233 – 10.3.161.238	10.3.161.239
63	10.3.161.240/29	10.3.161.241 – 10.3.161.246	10.3.161.247
64	10.3.161.248/29	10.3.161.249 – 10.3.161.254	10.3.161.255
65	10.3.162.0/29	10.3.162.1 – 10.3.162.6	10.3.162.7
66	10.3.162.8/29	10.3.162.9 – 10.3.162.14	10.3.162.15
67	10.3.162.16/29	10.3.162.17 – 10.3.162.22	10.3.162.23
68	10.3.162.24/29	10.3.162.25 – 10.3.162.30	10.3.162.31
69	10.3.162.32/29	10.3.162.33 – 10.3.162.38	10.3.162.39
70	10.3.162.40/29	10.3.162.41 – 10.3.162.46	10.3.162.47
71	10.3.162.48/29	10.3.162.49 – 10.3.162.54	10.3.162.55
72	10.3.162.56/29	10.3.162.57 – 10.3.162.62	10.3.162.63
73	10.3.162.64/29	10.3.162.65 – 10.3.162.70	10.3.162.71
74	10.3.162.72/29	10.3.162.73 – 10.3.162.78	10.3.162.79
75	10.3.162.80/29	10.3.162.81 – 10.3.162.86	10.3.162.87
76	10.3.162.88/29	10.3.162.89 – 10.3.162.94	10.3.162.95
77	10.3.162.96/29	10.3.162.97 – 10.3.162.102	10.3.162.103
78	10.3.162.104/29	10.3.162.105 – 10.3.162.110	10.3.162.111
79	10.3.162.112/29	10.3.162.113 – 10.3.162.118	10.3.162.119
80	10.3.162.120/29	10.3.162.121 – 10.3.162.126	10.3.162.127
81	10.3.162.128/29	10.3.162.129 – 10.3.162.134	10.3.162.135
82	10.3.162.136/29	10.3.162.137 – 10.3.162.142	10.3.162.143
83	10.3.162.144/29	10.3.162.145 – 10.3.162.150	10.3.162.151
84	10.3.162.152/29	10.3.162.153 – 10.3.162.158	10.3.162.159
85	10.3.162.160/29	10.3.162.161 – 10.3.162.166	10.3.162.167
86	10.3.162.168/29	10.3.162.169 – 10.3.162.174	10.3.162.175
87	10.3.162.176/29	10.3.162.177 – 10.3.162.182	10.3.162.183
88	10.3.162.184/29	10.3.162.185 – 10.3.162.190	10.3.162.191
89	10.3.162.192/29	10.3.162.193 – 10.3.162.198	10.3.162.199
90	10.3.162.200/29	10.3.162.201 – 10.3.162.206	10.3.162.207
91	10.3.162.208/29	10.3.162.209 – 10.3.162.214	10.3.162.215
92	10.3.162.216/29	10.3.162.217 – 10.3.162.222	10.3.162.223
93	10.3.162.224/29	10.3.162.225 – 10.3.162.230	10.3.162.231
94	10.3.162.232/29	10.3.162.233 – 10.3.162.238	10.3.162.239
95	10.3.162.240/29	10.3.162.241 – 10.3.162.246	10.3.162.247
96	10.3.162.248/29	10.3.162.249 – 10.3.162.254	10.3.162.255
97	10.3.163.0/29	10.3.163.1 – 10.3.163.6	10.3.163.7
98	10.3.163.8/29	10.3.163.9 – 10.3.163.14	10.3.163.15
99	10.3.163.16/29	10.3.163.17 – 10.3.163.22	10.3.163.23
100	10.3.163.24/29	10.3.163.25 – 10.3.163.30	10.3.163.31
101	10.3.163.32/29	10.3.163.33 – 10.3.163.38	10.3.163.39
102	10.3.163.40/29	10.3.163.41 – 10.3.163.46	10.3.163.47
103	10.3.163.48/29	10.3.163.49 – 10.3.163.54	10.3.163.55
104	10.3.163.56/29	10.3.163.57 – 10.3.163.62	10.3.163.63
105	10.3.163.64/29	10.3.163.65 – 10.3.163.70	10.3.163.71
106	10.3.163.72/29	10.3.163.73 – 10.3.163.78	10.3.163.79
107	10.3.163.80/29	10.3.163.81 – 10.3.163.86	10.3.163.87
108	10.3.163.88/29	10.3.163.89 – 10.3.163.94	10.3.163.95
109	10.3.163.96/29	10.3.163.97 – 10.3.163.102	10.3.163.103
110	10.3.163.104/29	10.3.163.105 – 10.3.163.110	10.3.163.111
111	10.3.163.112/29	10.3.163.113 – 10.3.163.118	10.3.163.119
112	10.3.163.120/29	10.3.163.121 – 10.3.163.126	10.3.163.127
113	10.3.163.128/29	10.3.163.129 – 10.3.163.134	10.3.163.135
114	10.3.163.136/29	10.3.163.137 – 10.3.163.142	10.3.163.143
115	10.3.163.144/29	10.3.163.145 – 10.3.163.150	10.3.163.151
116	10.3.163.152/29	10.3.163.153 – 10.3.163.158	10.3.163.159
117	10.3.163.160/29	10.3.163.161 – 10.3.163.166	10.3.163.167
118	10.3.163.168/29	10.3.163.169 – 10.3.163.174	10.3.163.175
119	10.3.163.176/29	10.3.163.177 – 10.3.163.182	10.3.163.183
120	10.3.163.184/29	10.3.163.185 – 10.3.163.190	10.3.163.191
121	10.3.163.192/29	10.3.163.193 – 10.3.163.198	10.3.163.199
122	10.3.163.200/29	10.3.163.201 – 10.3.163.206	10.3.163.207
123	10.3.163.208/29	10.3.163.209 – 10.3.163.214	10.3.163.215
124	10.3.163.216/29	10.3.163.217 – 10.3.163.222	10.3.163.223
125	10.3.163.224/29	10.3.163.225 – 10.3.163.230	10.3.163.231
126	10.3.163.232/29	10.3.163.233 – 10.3.163.238	10.3.163.239
127	10.3.163.240/29	10.3.163.241 – 10.3.163.246	10.3.163.247
128	10.3.163.248/29	10.3.163.249 – 10.3.163.254	10.3.163.255
129	10.3.164.0/29	10.3.164.1 – 10.3.164.6	10.3.164.7
130	10.3.164.8/29	10.3.164.9 – 10.3.164.14	10.3.164.15
131	10.3.164.16/29	10.3.164.17 – 10.3.164.22	10.3.164.23
132	10.3.164.24/29	10.3.164.25 – 10.3.164.30	10.3.164.31
133	10.3.164.32/29	10.3.164.33 – 10.3.164.38	10.3.164.39
134	10.3.164.40/29	10.3.164.41 – 10.3.164.46	10.3.164.47
135	10.3.164.48/29	10.3.164.49 – 10.3.164.54	10.3.164.55
136	10.3.164.56/29	10.3.164.57 – 10.3.164.62	10.3.164.63
137	10.3.164.64/29	10.3.164.65 – 10.3.164.70	10.3.164.71
138	10.3.164.72/29	10.3.164.73 – 10.3.164.78	10.3.164.79
139	10.3.164.80/29	10.3.164.81 – 10.3.164.86	10.3.164.87
140	10.3.164.88/29	10.3.164.89 – 10.3.164.94	10.3.164.95
141	10.3.164.96/29	10.3.164.97 – 10.3.164.102	10.3.164.103
142	10.3.164.104/29	10.3.164.105 – 10.3.164.110	10.3.164.111
143	10.3.164.112/29	10.3.164.113 – 10.3.164.118	10.3.164.119
144	10.3.164.120/29	10.3.164.121 – 10.3.164.126	10.3.164.127
145	10.3.164.128/29	10.3.164.129 – 10.3.164.134	10.3.164.135
146	10.3.164.136/29	10.3.164.137 – 10.3.164.142	10.3.164.143
147	10.3.164.144/29	10.3.164.145 – 10.3.164.150	10.3.164.151
148	10.3.164.152/29	10.3.164.153 – 10.3.164.158	10.3.164.159
149	10.3.164.160/29	10.3.164.161 – 10.3.164.166	10.3.164.167
150	10.3.164.168/29	10.3.164.169 – 10.3.164.174	10.3.164.175
151	10.3.164.176/29	10.3.164.177 – 10.3.164.182	10.3.164.183
152	10.3.164.184/29	10.3.164.185 – 10.3.164.190	10.3.164.191
153	10.3.164.192/29	10.3.164.193 – 10.3.164.198	10.3.164.199
154	10.3.164.200/29	10.3.164.201 – 10.3.164.206	10.3.164.207
155	10.3.164.208/29	10.3.164.209 – 10.3.164.214	10.3.164.215
156	10.3.164.216/29	10.3.164.217 – 10.3.164.222	10.3.164.223
157	10.3.164.224/29	10.3.164.225 – 10.3.164.230	10.3.164.231
158	10.3.164.232/29	10.3.164.233 – 10.3.164.238	10.3.164.239
159	10.3.164.240/29	10.3.164.241 – 10.3.164.246	10.3.164.247
160	10.3.164.248/29	10.3.164.249 – 10.3.164.254	10.3.164.255
161	10.3.165.0/29	10.3.165.1 – 10.3.165.6	10.3.165.7
162	10.3.165.8/29	10.3.165.9 – 10.3.165.14	10.3.165.15
163	10.3.165.16/29	10.3.165.17 – 10.3.165.22	10.3.165.23
164	10.3.165.24/29	10.3.165.25 – 10.3.165.30	10.3.165.31
165	10.3.165.32/29	10.3.165.33 – 10.3.165.38	10.3.165.39
166	10.3.165.40/29	10.3.165.41 – 10.3.165.46	10.3.165.47
167	10.3.165.48/29	10.3.165.49 – 10.3.165.54	10.3.165.55
168	10.3.165.56/29	10.3.165.57 – 10.3.165.62	10.3.165.63
169	10.3.165.64/29	10.3.165.65 – 10.3.165.70	10.3.165.71
170	10.3.165.72/29	10.3.165.73 – 10.3.165.78	10.3.165.79
171	10.3.165.80/29	10.3.165.81 – 10.3.165.86	10.3.165.87
172	10.3.165.88/29	10.3.165.89 – 10.3.165.94	10.3.165.95
173	10.3.165.96/29	10.3.165.97 – 10.3.165.102	10.3.165.103
174	10.3.165.104/29	10.3.165.105 – 10.3.165.110	10.3.165.111
175	10.3.165.112/29	10.3.165.113 – 10.3.165.118	10.3.165.119
176	10.3.165.120/29	10.3.165.121 – 10.3.165.126	10.3.165.127
177	10.3.165.128/29	10.3.165.129 – 10.3.165.134	10.3.165.135
178	10.3.165.136/29	10.3.165.137 – 10.3.165.142	10.3.165.143
179	10.3.165.144/29	10.3.165.145 – 10.3.165.150	10.3.165.151
180	10.3.165.152/29	10.3.165.153 – 10.3.165.158	10.3.165.159
181	10.3.165.160/29	10.3.165.161 – 10.3.165.166	10.3.165.167
182	10.3.165.168/29	10.3.165.169 – 10.3.165.174	10.3.165.175
183	10.3.165.176/29	10.3.165.177 – 10.3.165.182	10.3.165.183
184	10.3.165.184/29	10.3.165.185 – 10.3.165.190	10.3.165.191
185	10.3.165.192/29	10.3.165.193 – 10.3.165.198	10.3.165.199
186	10.3.165.200/29	10.3.165.201 – 10.3.165.206	10.3.165.207
187	10.3.165.208/29	10.3.165.209 – 10.3.165.214	10.3.165.215
188	10.3.165.216/29	10.3.165.217 – 10.3.165.222	10.3.165.223
189	10.3.165.224/29	10.3.165.225 – 10.3.165.230	10.3.165.231
190	10.3.165.232/29	10.3.165.233 – 10.3.165.238	10.3.165.239
191	10.3.165.240/29	10.3.165.241 – 10.3.165.246	10.3.165.247
192	10.3.165.248/29	10.3.165.249 – 10.3.165.254	10.3.165.255
193	10.3.166.0/29	10.3.166.1 – 10.3.166.6	10.3.166.7
194	10.3.166.8/29	10.3.166.9 – 10.3.166.14	10.3.166.15
195	10.3.166.16/29	10.3.166.17 – 10.3.166.22	10.3.166.23
196	10.3.166.24/29	10.3.166.25 – 10.3.166.30	10.3.166.31
197	10.3.166.32/29	10.3.166.33 – 10.3.166.38	10.3.166.39
198	10.3.166.40/29	10.3.166.41 – 10.3.166.46	10.3.166.47
199	10.3.166.48/29	10.3.166.49 – 10.3.166.54	10.3.166.55
200	10.3.166.56/29	10.3.166.57 – 10.3.166.62	10.3.166.63
201	10.3.166.64/29	10.3.166.65 – 10.3.166.70	10.3.166.71
202	10.3.166.72/29	10.3.166.73 – 10.3.166.78	10.3.166.79
203	10.3.166.80/29	10.3.166.81 – 10.3.166.86	10.3.166.87
204	10.3.166.88/29	10.3.166.89 – 10.3.166.94	10.3.166.95
205	10.3.166.96/29	10.3.166.97 – 10.3.166.102	10.3.166.103
206	10.3.166.104/29	10.3.166.105 – 10.3.166.110	10.3.166.111
207	10.3.166.112/29	10.3.166.113 – 10.3.166.118	10.3.166.119
208	10.3.166.120/29	10.3.166.121 – 10.3.166.126	10.3.166.127
209	10.3.166.128/29	10.3.166.129 – 10.3.166.134	10.3.166.135
210	10.3.166.136/29	10.3.166.137 – 10.3.166.142	10.3.166.143
211	10.3.166.144/29	10.3.166.145 – 10.3.166.150	10.3.166.151
212	10.3.166.152/29	10.3.166.153 – 10.3.166.158	10.3.166.159
213	10.3.166.160/29	10.3.166.161 – 10.3.166.166	10.3.166.167
214	10.3.166.168/29	10.3.166.169 – 10.3.166.174	10.3.166.175
215	10.3.166.176/29	10.3.166.177 – 10.3.166.182	10.3.166.183
216	10.3.166.184/29	10.3.166.185 – 10.3.166.190	10.3.166.191
217	10.3.166.192/29	10.3.166.193 – 10.3.166.198	10.3.166.199
218	10.3.166.200/29	10.3.166.201 – 10.3.166.206	10.3.166.207
219	10.3.166.208/29	10.3.166.209 – 10.3.166.214	10.3.166.215
220	10.3.166.216/29	10.3.166.217 – 10.3.166.222	10.3.166.223
221	10.3.166.224/29	10.3.166.225 – 10.3.166.230	10.3.166.231
222	10.3.166.232/29	10.3.166.233 – 10.3.166.238	10.3.166.239
223	10.3.166.240/29	10.3.166.241 – 10.3.166.246	10.3.166.247
224	10.3.166.248/29	10.3.166.249 – 10.3.166.254	10.3.166.255
225	10.3.167.0/29	10.3.167.1 – 10.3.167.6	10.3.167.7
226	10.3.167.8/29	10.3.167.9 – 10.3.167.14	10.3.167.15
227	10.3.167.16/29	10.3.167.17 – 10.3.167.22	10.3.167.23
228	10.3.167.24/29	10.3.167.25 – 10.3.167.30	10.3.167.31
229	10.3.167.32/29	10.3.167.33 – 10.3.167.38	10.3.167.39
230	10.3.167.40/29	10.3.167.41 – 10.3.167.46	10.3.167.47
231	10.3.167.48/29	10.3.167.49 – 10.3.167.54	10.3.167.55
232	10.3.167.56/29	10.3.167.57 – 10.3.167.62	10.3.167.63
233	10.3.167.64/29	10.3.167.65 – 10.3.167.70	10.3.167.71
234	10.3.167.72/29	10.3.167.73 – 10.3.167.78	10.3.167.79
235	10.3.167.80/29	10.3.167.81 – 10.3.167.86	10.3.167.87
236	10.3.167.88/29	10.3.167.89 – 10.3.167.94	10.3.167.95
237	10.3.167.96/29	10.3.167.97 – 10.3.167.102	10.3.167.103
238	10.3.167.104/29	10.3.167.105 – 10.3.167.110	10.3.167.111
239	10.3.167.112/29	10.3.167.113 – 10.3.167.118	10.3.167.119
240	10.3.167.120/29	10.3.167.121 – 10.3.167.126	10.3.167.127
241	10.3.167.128/29	10.3.167.129 – 10.3.167.134	10.3.167.135
242	10.3.167.136/29	10.3.167.137 – 10.3.167.142	10.3.167.143
243	10.3.167.144/29	10.3.167.145 – 10.3.167.150	10.3.167.151
244	10.3.167.152/29	10.3.167.153 – 10.3.167.158	10.3.167.159
245	10.3.167.160/29	10.3.167.161 – 10.3.167.166	10.3.167.167
246	10.3.167.168/29	10.3.167.169 – 10.3.167.174	10.3.167.175
247	10.3.167.176/29	10.3.167.177 – 10.3.167.182	10.3.167.183
248	10.3.167.184/29	10.3.167.185 – 10.3.167.190	10.3.167.191
249	10.3.167.192/29	10.3.167.193 – 10.3.167.198	10.3.167.199
250	10.3.167.200/29	10.3.167.201 – 10.3.167.206	10.3.167.207
251	10.3.167.208/29	10.3.167.209 – 10.3.167.214	10.3.167.215
252	10.3.167.216/29	10.3.167.217 – 10.3.167.222	10.3.167.223
253	10.3.167.224/29	10.3.167.225 – 10.3.167.230	10.3.167.231
254	10.3.167.232/29	10.3.167.233 – 10.3.167.238	10.3.167.239
255	10.3.167.240/29	10.3.167.241 – 10.3.167.246	10.3.167.247
256	10.3.167.248/29	10.3.167.249 – 10.3.167.254	10.3.167.255

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 →