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)172.16.15.192/26

network172.16.15.192/26

broadcast172.16.15.255

first host172.16.15.193

last host172.16.15.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classB

ipcalc 172.16.15.192/26

address10101100.00010000.00001111.11000000

subnet mask11111111.11111111.11111111.11000000

network10101100.00010000.00001111.11000000

broadcast10101100.00010000.00001111.11111111

green = network part, grey = host part

hex0xac100fc0

decimal2886733760

reverse dns192.15.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:fc0

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	172.16.15.192/31	172.16.15.192 – 172.16.15.193	172.16.15.193
2	172.16.15.194/31	172.16.15.194 – 172.16.15.195	172.16.15.195
3	172.16.15.196/31	172.16.15.196 – 172.16.15.197	172.16.15.197
4	172.16.15.198/31	172.16.15.198 – 172.16.15.199	172.16.15.199
5	172.16.15.200/31	172.16.15.200 – 172.16.15.201	172.16.15.201
6	172.16.15.202/31	172.16.15.202 – 172.16.15.203	172.16.15.203
7	172.16.15.204/31	172.16.15.204 – 172.16.15.205	172.16.15.205
8	172.16.15.206/31	172.16.15.206 – 172.16.15.207	172.16.15.207
9	172.16.15.208/31	172.16.15.208 – 172.16.15.209	172.16.15.209
10	172.16.15.210/31	172.16.15.210 – 172.16.15.211	172.16.15.211
11	172.16.15.212/31	172.16.15.212 – 172.16.15.213	172.16.15.213
12	172.16.15.214/31	172.16.15.214 – 172.16.15.215	172.16.15.215
13	172.16.15.216/31	172.16.15.216 – 172.16.15.217	172.16.15.217
14	172.16.15.218/31	172.16.15.218 – 172.16.15.219	172.16.15.219
15	172.16.15.220/31	172.16.15.220 – 172.16.15.221	172.16.15.221
16	172.16.15.222/31	172.16.15.222 – 172.16.15.223	172.16.15.223
17	172.16.15.224/31	172.16.15.224 – 172.16.15.225	172.16.15.225
18	172.16.15.226/31	172.16.15.226 – 172.16.15.227	172.16.15.227
19	172.16.15.228/31	172.16.15.228 – 172.16.15.229	172.16.15.229
20	172.16.15.230/31	172.16.15.230 – 172.16.15.231	172.16.15.231
21	172.16.15.232/31	172.16.15.232 – 172.16.15.233	172.16.15.233
22	172.16.15.234/31	172.16.15.234 – 172.16.15.235	172.16.15.235
23	172.16.15.236/31	172.16.15.236 – 172.16.15.237	172.16.15.237
24	172.16.15.238/31	172.16.15.238 – 172.16.15.239	172.16.15.239
25	172.16.15.240/31	172.16.15.240 – 172.16.15.241	172.16.15.241
26	172.16.15.242/31	172.16.15.242 – 172.16.15.243	172.16.15.243
27	172.16.15.244/31	172.16.15.244 – 172.16.15.245	172.16.15.245
28	172.16.15.246/31	172.16.15.246 – 172.16.15.247	172.16.15.247
29	172.16.15.248/31	172.16.15.248 – 172.16.15.249	172.16.15.249
30	172.16.15.250/31	172.16.15.250 – 172.16.15.251	172.16.15.251
31	172.16.15.252/31	172.16.15.252 – 172.16.15.253	172.16.15.253
32	172.16.15.254/31	172.16.15.254 – 172.16.15.255	172.16.15.255

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 →