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)10.0.94.128/25

network10.0.94.128/25

broadcast10.0.94.255

first host10.0.94.129

last host10.0.94.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.94.128/25

address00001010.00000000.01011110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01011110.10000000

broadcast00001010.00000000.01011110.11111111

green = network part, grey = host part

hex0x0a005e80

decimal167796352

reverse dns128.94.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:5e80

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.94.128/31	10.0.94.128 – 10.0.94.129	10.0.94.129
2	10.0.94.130/31	10.0.94.130 – 10.0.94.131	10.0.94.131
3	10.0.94.132/31	10.0.94.132 – 10.0.94.133	10.0.94.133
4	10.0.94.134/31	10.0.94.134 – 10.0.94.135	10.0.94.135
5	10.0.94.136/31	10.0.94.136 – 10.0.94.137	10.0.94.137
6	10.0.94.138/31	10.0.94.138 – 10.0.94.139	10.0.94.139
7	10.0.94.140/31	10.0.94.140 – 10.0.94.141	10.0.94.141
8	10.0.94.142/31	10.0.94.142 – 10.0.94.143	10.0.94.143
9	10.0.94.144/31	10.0.94.144 – 10.0.94.145	10.0.94.145
10	10.0.94.146/31	10.0.94.146 – 10.0.94.147	10.0.94.147
11	10.0.94.148/31	10.0.94.148 – 10.0.94.149	10.0.94.149
12	10.0.94.150/31	10.0.94.150 – 10.0.94.151	10.0.94.151
13	10.0.94.152/31	10.0.94.152 – 10.0.94.153	10.0.94.153
14	10.0.94.154/31	10.0.94.154 – 10.0.94.155	10.0.94.155
15	10.0.94.156/31	10.0.94.156 – 10.0.94.157	10.0.94.157
16	10.0.94.158/31	10.0.94.158 – 10.0.94.159	10.0.94.159
17	10.0.94.160/31	10.0.94.160 – 10.0.94.161	10.0.94.161
18	10.0.94.162/31	10.0.94.162 – 10.0.94.163	10.0.94.163
19	10.0.94.164/31	10.0.94.164 – 10.0.94.165	10.0.94.165
20	10.0.94.166/31	10.0.94.166 – 10.0.94.167	10.0.94.167
21	10.0.94.168/31	10.0.94.168 – 10.0.94.169	10.0.94.169
22	10.0.94.170/31	10.0.94.170 – 10.0.94.171	10.0.94.171
23	10.0.94.172/31	10.0.94.172 – 10.0.94.173	10.0.94.173
24	10.0.94.174/31	10.0.94.174 – 10.0.94.175	10.0.94.175
25	10.0.94.176/31	10.0.94.176 – 10.0.94.177	10.0.94.177
26	10.0.94.178/31	10.0.94.178 – 10.0.94.179	10.0.94.179
27	10.0.94.180/31	10.0.94.180 – 10.0.94.181	10.0.94.181
28	10.0.94.182/31	10.0.94.182 – 10.0.94.183	10.0.94.183
29	10.0.94.184/31	10.0.94.184 – 10.0.94.185	10.0.94.185
30	10.0.94.186/31	10.0.94.186 – 10.0.94.187	10.0.94.187
31	10.0.94.188/31	10.0.94.188 – 10.0.94.189	10.0.94.189
32	10.0.94.190/31	10.0.94.190 – 10.0.94.191	10.0.94.191
33	10.0.94.192/31	10.0.94.192 – 10.0.94.193	10.0.94.193
34	10.0.94.194/31	10.0.94.194 – 10.0.94.195	10.0.94.195
35	10.0.94.196/31	10.0.94.196 – 10.0.94.197	10.0.94.197
36	10.0.94.198/31	10.0.94.198 – 10.0.94.199	10.0.94.199
37	10.0.94.200/31	10.0.94.200 – 10.0.94.201	10.0.94.201
38	10.0.94.202/31	10.0.94.202 – 10.0.94.203	10.0.94.203
39	10.0.94.204/31	10.0.94.204 – 10.0.94.205	10.0.94.205
40	10.0.94.206/31	10.0.94.206 – 10.0.94.207	10.0.94.207
41	10.0.94.208/31	10.0.94.208 – 10.0.94.209	10.0.94.209
42	10.0.94.210/31	10.0.94.210 – 10.0.94.211	10.0.94.211
43	10.0.94.212/31	10.0.94.212 – 10.0.94.213	10.0.94.213
44	10.0.94.214/31	10.0.94.214 – 10.0.94.215	10.0.94.215
45	10.0.94.216/31	10.0.94.216 – 10.0.94.217	10.0.94.217
46	10.0.94.218/31	10.0.94.218 – 10.0.94.219	10.0.94.219
47	10.0.94.220/31	10.0.94.220 – 10.0.94.221	10.0.94.221
48	10.0.94.222/31	10.0.94.222 – 10.0.94.223	10.0.94.223
49	10.0.94.224/31	10.0.94.224 – 10.0.94.225	10.0.94.225
50	10.0.94.226/31	10.0.94.226 – 10.0.94.227	10.0.94.227
51	10.0.94.228/31	10.0.94.228 – 10.0.94.229	10.0.94.229
52	10.0.94.230/31	10.0.94.230 – 10.0.94.231	10.0.94.231
53	10.0.94.232/31	10.0.94.232 – 10.0.94.233	10.0.94.233
54	10.0.94.234/31	10.0.94.234 – 10.0.94.235	10.0.94.235
55	10.0.94.236/31	10.0.94.236 – 10.0.94.237	10.0.94.237
56	10.0.94.238/31	10.0.94.238 – 10.0.94.239	10.0.94.239
57	10.0.94.240/31	10.0.94.240 – 10.0.94.241	10.0.94.241
58	10.0.94.242/31	10.0.94.242 – 10.0.94.243	10.0.94.243
59	10.0.94.244/31	10.0.94.244 – 10.0.94.245	10.0.94.245
60	10.0.94.246/31	10.0.94.246 – 10.0.94.247	10.0.94.247
61	10.0.94.248/31	10.0.94.248 – 10.0.94.249	10.0.94.249
62	10.0.94.250/31	10.0.94.250 – 10.0.94.251	10.0.94.251
63	10.0.94.252/31	10.0.94.252 – 10.0.94.253	10.0.94.253
64	10.0.94.254/31	10.0.94.254 – 10.0.94.255	10.0.94.255

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 /25
/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	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 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 →