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)10.2.112.0/21

network10.2.112.0/21

broadcast10.2.119.255

first host10.2.112.1

last host10.2.119.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.112.0/21

address00001010.00000010.01110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.01110000.00000000

broadcast00001010.00000010.01110111.11111111

green = network part, grey = host part

hex0x0a027000

decimal167931904

reverse dns0.112.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7000

/21 split into /29 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.112.0/29	10.2.112.1 – 10.2.112.6	10.2.112.7
2	10.2.112.8/29	10.2.112.9 – 10.2.112.14	10.2.112.15
3	10.2.112.16/29	10.2.112.17 – 10.2.112.22	10.2.112.23
4	10.2.112.24/29	10.2.112.25 – 10.2.112.30	10.2.112.31
5	10.2.112.32/29	10.2.112.33 – 10.2.112.38	10.2.112.39
6	10.2.112.40/29	10.2.112.41 – 10.2.112.46	10.2.112.47
7	10.2.112.48/29	10.2.112.49 – 10.2.112.54	10.2.112.55
8	10.2.112.56/29	10.2.112.57 – 10.2.112.62	10.2.112.63
9	10.2.112.64/29	10.2.112.65 – 10.2.112.70	10.2.112.71
10	10.2.112.72/29	10.2.112.73 – 10.2.112.78	10.2.112.79
11	10.2.112.80/29	10.2.112.81 – 10.2.112.86	10.2.112.87
12	10.2.112.88/29	10.2.112.89 – 10.2.112.94	10.2.112.95
13	10.2.112.96/29	10.2.112.97 – 10.2.112.102	10.2.112.103
14	10.2.112.104/29	10.2.112.105 – 10.2.112.110	10.2.112.111
15	10.2.112.112/29	10.2.112.113 – 10.2.112.118	10.2.112.119
16	10.2.112.120/29	10.2.112.121 – 10.2.112.126	10.2.112.127
17	10.2.112.128/29	10.2.112.129 – 10.2.112.134	10.2.112.135
18	10.2.112.136/29	10.2.112.137 – 10.2.112.142	10.2.112.143
19	10.2.112.144/29	10.2.112.145 – 10.2.112.150	10.2.112.151
20	10.2.112.152/29	10.2.112.153 – 10.2.112.158	10.2.112.159
21	10.2.112.160/29	10.2.112.161 – 10.2.112.166	10.2.112.167
22	10.2.112.168/29	10.2.112.169 – 10.2.112.174	10.2.112.175
23	10.2.112.176/29	10.2.112.177 – 10.2.112.182	10.2.112.183
24	10.2.112.184/29	10.2.112.185 – 10.2.112.190	10.2.112.191
25	10.2.112.192/29	10.2.112.193 – 10.2.112.198	10.2.112.199
26	10.2.112.200/29	10.2.112.201 – 10.2.112.206	10.2.112.207
27	10.2.112.208/29	10.2.112.209 – 10.2.112.214	10.2.112.215
28	10.2.112.216/29	10.2.112.217 – 10.2.112.222	10.2.112.223
29	10.2.112.224/29	10.2.112.225 – 10.2.112.230	10.2.112.231
30	10.2.112.232/29	10.2.112.233 – 10.2.112.238	10.2.112.239
31	10.2.112.240/29	10.2.112.241 – 10.2.112.246	10.2.112.247
32	10.2.112.248/29	10.2.112.249 – 10.2.112.254	10.2.112.255
33	10.2.113.0/29	10.2.113.1 – 10.2.113.6	10.2.113.7
34	10.2.113.8/29	10.2.113.9 – 10.2.113.14	10.2.113.15
35	10.2.113.16/29	10.2.113.17 – 10.2.113.22	10.2.113.23
36	10.2.113.24/29	10.2.113.25 – 10.2.113.30	10.2.113.31
37	10.2.113.32/29	10.2.113.33 – 10.2.113.38	10.2.113.39
38	10.2.113.40/29	10.2.113.41 – 10.2.113.46	10.2.113.47
39	10.2.113.48/29	10.2.113.49 – 10.2.113.54	10.2.113.55
40	10.2.113.56/29	10.2.113.57 – 10.2.113.62	10.2.113.63
41	10.2.113.64/29	10.2.113.65 – 10.2.113.70	10.2.113.71
42	10.2.113.72/29	10.2.113.73 – 10.2.113.78	10.2.113.79
43	10.2.113.80/29	10.2.113.81 – 10.2.113.86	10.2.113.87
44	10.2.113.88/29	10.2.113.89 – 10.2.113.94	10.2.113.95
45	10.2.113.96/29	10.2.113.97 – 10.2.113.102	10.2.113.103
46	10.2.113.104/29	10.2.113.105 – 10.2.113.110	10.2.113.111
47	10.2.113.112/29	10.2.113.113 – 10.2.113.118	10.2.113.119
48	10.2.113.120/29	10.2.113.121 – 10.2.113.126	10.2.113.127
49	10.2.113.128/29	10.2.113.129 – 10.2.113.134	10.2.113.135
50	10.2.113.136/29	10.2.113.137 – 10.2.113.142	10.2.113.143
51	10.2.113.144/29	10.2.113.145 – 10.2.113.150	10.2.113.151
52	10.2.113.152/29	10.2.113.153 – 10.2.113.158	10.2.113.159
53	10.2.113.160/29	10.2.113.161 – 10.2.113.166	10.2.113.167
54	10.2.113.168/29	10.2.113.169 – 10.2.113.174	10.2.113.175
55	10.2.113.176/29	10.2.113.177 – 10.2.113.182	10.2.113.183
56	10.2.113.184/29	10.2.113.185 – 10.2.113.190	10.2.113.191
57	10.2.113.192/29	10.2.113.193 – 10.2.113.198	10.2.113.199
58	10.2.113.200/29	10.2.113.201 – 10.2.113.206	10.2.113.207
59	10.2.113.208/29	10.2.113.209 – 10.2.113.214	10.2.113.215
60	10.2.113.216/29	10.2.113.217 – 10.2.113.222	10.2.113.223
61	10.2.113.224/29	10.2.113.225 – 10.2.113.230	10.2.113.231
62	10.2.113.232/29	10.2.113.233 – 10.2.113.238	10.2.113.239
63	10.2.113.240/29	10.2.113.241 – 10.2.113.246	10.2.113.247
64	10.2.113.248/29	10.2.113.249 – 10.2.113.254	10.2.113.255
65	10.2.114.0/29	10.2.114.1 – 10.2.114.6	10.2.114.7
66	10.2.114.8/29	10.2.114.9 – 10.2.114.14	10.2.114.15
67	10.2.114.16/29	10.2.114.17 – 10.2.114.22	10.2.114.23
68	10.2.114.24/29	10.2.114.25 – 10.2.114.30	10.2.114.31
69	10.2.114.32/29	10.2.114.33 – 10.2.114.38	10.2.114.39
70	10.2.114.40/29	10.2.114.41 – 10.2.114.46	10.2.114.47
71	10.2.114.48/29	10.2.114.49 – 10.2.114.54	10.2.114.55
72	10.2.114.56/29	10.2.114.57 – 10.2.114.62	10.2.114.63
73	10.2.114.64/29	10.2.114.65 – 10.2.114.70	10.2.114.71
74	10.2.114.72/29	10.2.114.73 – 10.2.114.78	10.2.114.79
75	10.2.114.80/29	10.2.114.81 – 10.2.114.86	10.2.114.87
76	10.2.114.88/29	10.2.114.89 – 10.2.114.94	10.2.114.95
77	10.2.114.96/29	10.2.114.97 – 10.2.114.102	10.2.114.103
78	10.2.114.104/29	10.2.114.105 – 10.2.114.110	10.2.114.111
79	10.2.114.112/29	10.2.114.113 – 10.2.114.118	10.2.114.119
80	10.2.114.120/29	10.2.114.121 – 10.2.114.126	10.2.114.127
81	10.2.114.128/29	10.2.114.129 – 10.2.114.134	10.2.114.135
82	10.2.114.136/29	10.2.114.137 – 10.2.114.142	10.2.114.143
83	10.2.114.144/29	10.2.114.145 – 10.2.114.150	10.2.114.151
84	10.2.114.152/29	10.2.114.153 – 10.2.114.158	10.2.114.159
85	10.2.114.160/29	10.2.114.161 – 10.2.114.166	10.2.114.167
86	10.2.114.168/29	10.2.114.169 – 10.2.114.174	10.2.114.175
87	10.2.114.176/29	10.2.114.177 – 10.2.114.182	10.2.114.183
88	10.2.114.184/29	10.2.114.185 – 10.2.114.190	10.2.114.191
89	10.2.114.192/29	10.2.114.193 – 10.2.114.198	10.2.114.199
90	10.2.114.200/29	10.2.114.201 – 10.2.114.206	10.2.114.207
91	10.2.114.208/29	10.2.114.209 – 10.2.114.214	10.2.114.215
92	10.2.114.216/29	10.2.114.217 – 10.2.114.222	10.2.114.223
93	10.2.114.224/29	10.2.114.225 – 10.2.114.230	10.2.114.231
94	10.2.114.232/29	10.2.114.233 – 10.2.114.238	10.2.114.239
95	10.2.114.240/29	10.2.114.241 – 10.2.114.246	10.2.114.247
96	10.2.114.248/29	10.2.114.249 – 10.2.114.254	10.2.114.255
97	10.2.115.0/29	10.2.115.1 – 10.2.115.6	10.2.115.7
98	10.2.115.8/29	10.2.115.9 – 10.2.115.14	10.2.115.15
99	10.2.115.16/29	10.2.115.17 – 10.2.115.22	10.2.115.23
100	10.2.115.24/29	10.2.115.25 – 10.2.115.30	10.2.115.31
101	10.2.115.32/29	10.2.115.33 – 10.2.115.38	10.2.115.39
102	10.2.115.40/29	10.2.115.41 – 10.2.115.46	10.2.115.47
103	10.2.115.48/29	10.2.115.49 – 10.2.115.54	10.2.115.55
104	10.2.115.56/29	10.2.115.57 – 10.2.115.62	10.2.115.63
105	10.2.115.64/29	10.2.115.65 – 10.2.115.70	10.2.115.71
106	10.2.115.72/29	10.2.115.73 – 10.2.115.78	10.2.115.79
107	10.2.115.80/29	10.2.115.81 – 10.2.115.86	10.2.115.87
108	10.2.115.88/29	10.2.115.89 – 10.2.115.94	10.2.115.95
109	10.2.115.96/29	10.2.115.97 – 10.2.115.102	10.2.115.103
110	10.2.115.104/29	10.2.115.105 – 10.2.115.110	10.2.115.111
111	10.2.115.112/29	10.2.115.113 – 10.2.115.118	10.2.115.119
112	10.2.115.120/29	10.2.115.121 – 10.2.115.126	10.2.115.127
113	10.2.115.128/29	10.2.115.129 – 10.2.115.134	10.2.115.135
114	10.2.115.136/29	10.2.115.137 – 10.2.115.142	10.2.115.143
115	10.2.115.144/29	10.2.115.145 – 10.2.115.150	10.2.115.151
116	10.2.115.152/29	10.2.115.153 – 10.2.115.158	10.2.115.159
117	10.2.115.160/29	10.2.115.161 – 10.2.115.166	10.2.115.167
118	10.2.115.168/29	10.2.115.169 – 10.2.115.174	10.2.115.175
119	10.2.115.176/29	10.2.115.177 – 10.2.115.182	10.2.115.183
120	10.2.115.184/29	10.2.115.185 – 10.2.115.190	10.2.115.191
121	10.2.115.192/29	10.2.115.193 – 10.2.115.198	10.2.115.199
122	10.2.115.200/29	10.2.115.201 – 10.2.115.206	10.2.115.207
123	10.2.115.208/29	10.2.115.209 – 10.2.115.214	10.2.115.215
124	10.2.115.216/29	10.2.115.217 – 10.2.115.222	10.2.115.223
125	10.2.115.224/29	10.2.115.225 – 10.2.115.230	10.2.115.231
126	10.2.115.232/29	10.2.115.233 – 10.2.115.238	10.2.115.239
127	10.2.115.240/29	10.2.115.241 – 10.2.115.246	10.2.115.247
128	10.2.115.248/29	10.2.115.249 – 10.2.115.254	10.2.115.255
129	10.2.116.0/29	10.2.116.1 – 10.2.116.6	10.2.116.7
130	10.2.116.8/29	10.2.116.9 – 10.2.116.14	10.2.116.15
131	10.2.116.16/29	10.2.116.17 – 10.2.116.22	10.2.116.23
132	10.2.116.24/29	10.2.116.25 – 10.2.116.30	10.2.116.31
133	10.2.116.32/29	10.2.116.33 – 10.2.116.38	10.2.116.39
134	10.2.116.40/29	10.2.116.41 – 10.2.116.46	10.2.116.47
135	10.2.116.48/29	10.2.116.49 – 10.2.116.54	10.2.116.55
136	10.2.116.56/29	10.2.116.57 – 10.2.116.62	10.2.116.63
137	10.2.116.64/29	10.2.116.65 – 10.2.116.70	10.2.116.71
138	10.2.116.72/29	10.2.116.73 – 10.2.116.78	10.2.116.79
139	10.2.116.80/29	10.2.116.81 – 10.2.116.86	10.2.116.87
140	10.2.116.88/29	10.2.116.89 – 10.2.116.94	10.2.116.95
141	10.2.116.96/29	10.2.116.97 – 10.2.116.102	10.2.116.103
142	10.2.116.104/29	10.2.116.105 – 10.2.116.110	10.2.116.111
143	10.2.116.112/29	10.2.116.113 – 10.2.116.118	10.2.116.119
144	10.2.116.120/29	10.2.116.121 – 10.2.116.126	10.2.116.127
145	10.2.116.128/29	10.2.116.129 – 10.2.116.134	10.2.116.135
146	10.2.116.136/29	10.2.116.137 – 10.2.116.142	10.2.116.143
147	10.2.116.144/29	10.2.116.145 – 10.2.116.150	10.2.116.151
148	10.2.116.152/29	10.2.116.153 – 10.2.116.158	10.2.116.159
149	10.2.116.160/29	10.2.116.161 – 10.2.116.166	10.2.116.167
150	10.2.116.168/29	10.2.116.169 – 10.2.116.174	10.2.116.175
151	10.2.116.176/29	10.2.116.177 – 10.2.116.182	10.2.116.183
152	10.2.116.184/29	10.2.116.185 – 10.2.116.190	10.2.116.191
153	10.2.116.192/29	10.2.116.193 – 10.2.116.198	10.2.116.199
154	10.2.116.200/29	10.2.116.201 – 10.2.116.206	10.2.116.207
155	10.2.116.208/29	10.2.116.209 – 10.2.116.214	10.2.116.215
156	10.2.116.216/29	10.2.116.217 – 10.2.116.222	10.2.116.223
157	10.2.116.224/29	10.2.116.225 – 10.2.116.230	10.2.116.231
158	10.2.116.232/29	10.2.116.233 – 10.2.116.238	10.2.116.239
159	10.2.116.240/29	10.2.116.241 – 10.2.116.246	10.2.116.247
160	10.2.116.248/29	10.2.116.249 – 10.2.116.254	10.2.116.255
161	10.2.117.0/29	10.2.117.1 – 10.2.117.6	10.2.117.7
162	10.2.117.8/29	10.2.117.9 – 10.2.117.14	10.2.117.15
163	10.2.117.16/29	10.2.117.17 – 10.2.117.22	10.2.117.23
164	10.2.117.24/29	10.2.117.25 – 10.2.117.30	10.2.117.31
165	10.2.117.32/29	10.2.117.33 – 10.2.117.38	10.2.117.39
166	10.2.117.40/29	10.2.117.41 – 10.2.117.46	10.2.117.47
167	10.2.117.48/29	10.2.117.49 – 10.2.117.54	10.2.117.55
168	10.2.117.56/29	10.2.117.57 – 10.2.117.62	10.2.117.63
169	10.2.117.64/29	10.2.117.65 – 10.2.117.70	10.2.117.71
170	10.2.117.72/29	10.2.117.73 – 10.2.117.78	10.2.117.79
171	10.2.117.80/29	10.2.117.81 – 10.2.117.86	10.2.117.87
172	10.2.117.88/29	10.2.117.89 – 10.2.117.94	10.2.117.95
173	10.2.117.96/29	10.2.117.97 – 10.2.117.102	10.2.117.103
174	10.2.117.104/29	10.2.117.105 – 10.2.117.110	10.2.117.111
175	10.2.117.112/29	10.2.117.113 – 10.2.117.118	10.2.117.119
176	10.2.117.120/29	10.2.117.121 – 10.2.117.126	10.2.117.127
177	10.2.117.128/29	10.2.117.129 – 10.2.117.134	10.2.117.135
178	10.2.117.136/29	10.2.117.137 – 10.2.117.142	10.2.117.143
179	10.2.117.144/29	10.2.117.145 – 10.2.117.150	10.2.117.151
180	10.2.117.152/29	10.2.117.153 – 10.2.117.158	10.2.117.159
181	10.2.117.160/29	10.2.117.161 – 10.2.117.166	10.2.117.167
182	10.2.117.168/29	10.2.117.169 – 10.2.117.174	10.2.117.175
183	10.2.117.176/29	10.2.117.177 – 10.2.117.182	10.2.117.183
184	10.2.117.184/29	10.2.117.185 – 10.2.117.190	10.2.117.191
185	10.2.117.192/29	10.2.117.193 – 10.2.117.198	10.2.117.199
186	10.2.117.200/29	10.2.117.201 – 10.2.117.206	10.2.117.207
187	10.2.117.208/29	10.2.117.209 – 10.2.117.214	10.2.117.215
188	10.2.117.216/29	10.2.117.217 – 10.2.117.222	10.2.117.223
189	10.2.117.224/29	10.2.117.225 – 10.2.117.230	10.2.117.231
190	10.2.117.232/29	10.2.117.233 – 10.2.117.238	10.2.117.239
191	10.2.117.240/29	10.2.117.241 – 10.2.117.246	10.2.117.247
192	10.2.117.248/29	10.2.117.249 – 10.2.117.254	10.2.117.255
193	10.2.118.0/29	10.2.118.1 – 10.2.118.6	10.2.118.7
194	10.2.118.8/29	10.2.118.9 – 10.2.118.14	10.2.118.15
195	10.2.118.16/29	10.2.118.17 – 10.2.118.22	10.2.118.23
196	10.2.118.24/29	10.2.118.25 – 10.2.118.30	10.2.118.31
197	10.2.118.32/29	10.2.118.33 – 10.2.118.38	10.2.118.39
198	10.2.118.40/29	10.2.118.41 – 10.2.118.46	10.2.118.47
199	10.2.118.48/29	10.2.118.49 – 10.2.118.54	10.2.118.55
200	10.2.118.56/29	10.2.118.57 – 10.2.118.62	10.2.118.63
201	10.2.118.64/29	10.2.118.65 – 10.2.118.70	10.2.118.71
202	10.2.118.72/29	10.2.118.73 – 10.2.118.78	10.2.118.79
203	10.2.118.80/29	10.2.118.81 – 10.2.118.86	10.2.118.87
204	10.2.118.88/29	10.2.118.89 – 10.2.118.94	10.2.118.95
205	10.2.118.96/29	10.2.118.97 – 10.2.118.102	10.2.118.103
206	10.2.118.104/29	10.2.118.105 – 10.2.118.110	10.2.118.111
207	10.2.118.112/29	10.2.118.113 – 10.2.118.118	10.2.118.119
208	10.2.118.120/29	10.2.118.121 – 10.2.118.126	10.2.118.127
209	10.2.118.128/29	10.2.118.129 – 10.2.118.134	10.2.118.135
210	10.2.118.136/29	10.2.118.137 – 10.2.118.142	10.2.118.143
211	10.2.118.144/29	10.2.118.145 – 10.2.118.150	10.2.118.151
212	10.2.118.152/29	10.2.118.153 – 10.2.118.158	10.2.118.159
213	10.2.118.160/29	10.2.118.161 – 10.2.118.166	10.2.118.167
214	10.2.118.168/29	10.2.118.169 – 10.2.118.174	10.2.118.175
215	10.2.118.176/29	10.2.118.177 – 10.2.118.182	10.2.118.183
216	10.2.118.184/29	10.2.118.185 – 10.2.118.190	10.2.118.191
217	10.2.118.192/29	10.2.118.193 – 10.2.118.198	10.2.118.199
218	10.2.118.200/29	10.2.118.201 – 10.2.118.206	10.2.118.207
219	10.2.118.208/29	10.2.118.209 – 10.2.118.214	10.2.118.215
220	10.2.118.216/29	10.2.118.217 – 10.2.118.222	10.2.118.223
221	10.2.118.224/29	10.2.118.225 – 10.2.118.230	10.2.118.231
222	10.2.118.232/29	10.2.118.233 – 10.2.118.238	10.2.118.239
223	10.2.118.240/29	10.2.118.241 – 10.2.118.246	10.2.118.247
224	10.2.118.248/29	10.2.118.249 – 10.2.118.254	10.2.118.255
225	10.2.119.0/29	10.2.119.1 – 10.2.119.6	10.2.119.7
226	10.2.119.8/29	10.2.119.9 – 10.2.119.14	10.2.119.15
227	10.2.119.16/29	10.2.119.17 – 10.2.119.22	10.2.119.23
228	10.2.119.24/29	10.2.119.25 – 10.2.119.30	10.2.119.31
229	10.2.119.32/29	10.2.119.33 – 10.2.119.38	10.2.119.39
230	10.2.119.40/29	10.2.119.41 – 10.2.119.46	10.2.119.47
231	10.2.119.48/29	10.2.119.49 – 10.2.119.54	10.2.119.55
232	10.2.119.56/29	10.2.119.57 – 10.2.119.62	10.2.119.63
233	10.2.119.64/29	10.2.119.65 – 10.2.119.70	10.2.119.71
234	10.2.119.72/29	10.2.119.73 – 10.2.119.78	10.2.119.79
235	10.2.119.80/29	10.2.119.81 – 10.2.119.86	10.2.119.87
236	10.2.119.88/29	10.2.119.89 – 10.2.119.94	10.2.119.95
237	10.2.119.96/29	10.2.119.97 – 10.2.119.102	10.2.119.103
238	10.2.119.104/29	10.2.119.105 – 10.2.119.110	10.2.119.111
239	10.2.119.112/29	10.2.119.113 – 10.2.119.118	10.2.119.119
240	10.2.119.120/29	10.2.119.121 – 10.2.119.126	10.2.119.127
241	10.2.119.128/29	10.2.119.129 – 10.2.119.134	10.2.119.135
242	10.2.119.136/29	10.2.119.137 – 10.2.119.142	10.2.119.143
243	10.2.119.144/29	10.2.119.145 – 10.2.119.150	10.2.119.151
244	10.2.119.152/29	10.2.119.153 – 10.2.119.158	10.2.119.159
245	10.2.119.160/29	10.2.119.161 – 10.2.119.166	10.2.119.167
246	10.2.119.168/29	10.2.119.169 – 10.2.119.174	10.2.119.175
247	10.2.119.176/29	10.2.119.177 – 10.2.119.182	10.2.119.183
248	10.2.119.184/29	10.2.119.185 – 10.2.119.190	10.2.119.191
249	10.2.119.192/29	10.2.119.193 – 10.2.119.198	10.2.119.199
250	10.2.119.200/29	10.2.119.201 – 10.2.119.206	10.2.119.207
251	10.2.119.208/29	10.2.119.209 – 10.2.119.214	10.2.119.215
252	10.2.119.216/29	10.2.119.217 – 10.2.119.222	10.2.119.223
253	10.2.119.224/29	10.2.119.225 – 10.2.119.230	10.2.119.231
254	10.2.119.232/29	10.2.119.233 – 10.2.119.238	10.2.119.239
255	10.2.119.240/29	10.2.119.241 – 10.2.119.246	10.2.119.247
256	10.2.119.248/29	10.2.119.249 – 10.2.119.254	10.2.119.255

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 →