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)10.167.42.192/26

network10.167.42.192/26

broadcast10.167.42.255

first host10.167.42.193

last host10.167.42.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.167.42.192/26

address00001010.10100111.00101010.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.10100111.00101010.11000000

broadcast00001010.10100111.00101010.11111111

green = network part, grey = host part

hex0x0aa72ac0

decimal178727616

reverse dns192.42.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2ac0

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	10.167.42.192/31	10.167.42.192 – 10.167.42.193	10.167.42.193
2	10.167.42.194/31	10.167.42.194 – 10.167.42.195	10.167.42.195
3	10.167.42.196/31	10.167.42.196 – 10.167.42.197	10.167.42.197
4	10.167.42.198/31	10.167.42.198 – 10.167.42.199	10.167.42.199
5	10.167.42.200/31	10.167.42.200 – 10.167.42.201	10.167.42.201
6	10.167.42.202/31	10.167.42.202 – 10.167.42.203	10.167.42.203
7	10.167.42.204/31	10.167.42.204 – 10.167.42.205	10.167.42.205
8	10.167.42.206/31	10.167.42.206 – 10.167.42.207	10.167.42.207
9	10.167.42.208/31	10.167.42.208 – 10.167.42.209	10.167.42.209
10	10.167.42.210/31	10.167.42.210 – 10.167.42.211	10.167.42.211
11	10.167.42.212/31	10.167.42.212 – 10.167.42.213	10.167.42.213
12	10.167.42.214/31	10.167.42.214 – 10.167.42.215	10.167.42.215
13	10.167.42.216/31	10.167.42.216 – 10.167.42.217	10.167.42.217
14	10.167.42.218/31	10.167.42.218 – 10.167.42.219	10.167.42.219
15	10.167.42.220/31	10.167.42.220 – 10.167.42.221	10.167.42.221
16	10.167.42.222/31	10.167.42.222 – 10.167.42.223	10.167.42.223
17	10.167.42.224/31	10.167.42.224 – 10.167.42.225	10.167.42.225
18	10.167.42.226/31	10.167.42.226 – 10.167.42.227	10.167.42.227
19	10.167.42.228/31	10.167.42.228 – 10.167.42.229	10.167.42.229
20	10.167.42.230/31	10.167.42.230 – 10.167.42.231	10.167.42.231
21	10.167.42.232/31	10.167.42.232 – 10.167.42.233	10.167.42.233
22	10.167.42.234/31	10.167.42.234 – 10.167.42.235	10.167.42.235
23	10.167.42.236/31	10.167.42.236 – 10.167.42.237	10.167.42.237
24	10.167.42.238/31	10.167.42.238 – 10.167.42.239	10.167.42.239
25	10.167.42.240/31	10.167.42.240 – 10.167.42.241	10.167.42.241
26	10.167.42.242/31	10.167.42.242 – 10.167.42.243	10.167.42.243
27	10.167.42.244/31	10.167.42.244 – 10.167.42.245	10.167.42.245
28	10.167.42.246/31	10.167.42.246 – 10.167.42.247	10.167.42.247
29	10.167.42.248/31	10.167.42.248 – 10.167.42.249	10.167.42.249
30	10.167.42.250/31	10.167.42.250 – 10.167.42.251	10.167.42.251
31	10.167.42.252/31	10.167.42.252 – 10.167.42.253	10.167.42.253
32	10.167.42.254/31	10.167.42.254 – 10.167.42.255	10.167.42.255

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 /26
/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	-
/26	255.255.255.192	64	62	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 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 →