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)10.63.15.192/26

network10.63.15.192/26

broadcast10.63.15.255

first host10.63.15.193

last host10.63.15.254

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.63.15.192/26

address00001010.00111111.00001111.11000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00111111.00001111.11000000

broadcast00001010.00111111.00001111.11111111

green = network part, grey = host part

hex0x0a3f0fc0

decimal171904960

reverse dns192.15.63.10.in-addr.arpa

ipv4-mapped::ffff:a3f:fc0

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	10.63.15.192/31	10.63.15.192 – 10.63.15.193	10.63.15.193
2	10.63.15.194/31	10.63.15.194 – 10.63.15.195	10.63.15.195
3	10.63.15.196/31	10.63.15.196 – 10.63.15.197	10.63.15.197
4	10.63.15.198/31	10.63.15.198 – 10.63.15.199	10.63.15.199
5	10.63.15.200/31	10.63.15.200 – 10.63.15.201	10.63.15.201
6	10.63.15.202/31	10.63.15.202 – 10.63.15.203	10.63.15.203
7	10.63.15.204/31	10.63.15.204 – 10.63.15.205	10.63.15.205
8	10.63.15.206/31	10.63.15.206 – 10.63.15.207	10.63.15.207
9	10.63.15.208/31	10.63.15.208 – 10.63.15.209	10.63.15.209
10	10.63.15.210/31	10.63.15.210 – 10.63.15.211	10.63.15.211
11	10.63.15.212/31	10.63.15.212 – 10.63.15.213	10.63.15.213
12	10.63.15.214/31	10.63.15.214 – 10.63.15.215	10.63.15.215
13	10.63.15.216/31	10.63.15.216 – 10.63.15.217	10.63.15.217
14	10.63.15.218/31	10.63.15.218 – 10.63.15.219	10.63.15.219
15	10.63.15.220/31	10.63.15.220 – 10.63.15.221	10.63.15.221
16	10.63.15.222/31	10.63.15.222 – 10.63.15.223	10.63.15.223
17	10.63.15.224/31	10.63.15.224 – 10.63.15.225	10.63.15.225
18	10.63.15.226/31	10.63.15.226 – 10.63.15.227	10.63.15.227
19	10.63.15.228/31	10.63.15.228 – 10.63.15.229	10.63.15.229
20	10.63.15.230/31	10.63.15.230 – 10.63.15.231	10.63.15.231
21	10.63.15.232/31	10.63.15.232 – 10.63.15.233	10.63.15.233
22	10.63.15.234/31	10.63.15.234 – 10.63.15.235	10.63.15.235
23	10.63.15.236/31	10.63.15.236 – 10.63.15.237	10.63.15.237
24	10.63.15.238/31	10.63.15.238 – 10.63.15.239	10.63.15.239
25	10.63.15.240/31	10.63.15.240 – 10.63.15.241	10.63.15.241
26	10.63.15.242/31	10.63.15.242 – 10.63.15.243	10.63.15.243
27	10.63.15.244/31	10.63.15.244 – 10.63.15.245	10.63.15.245
28	10.63.15.246/31	10.63.15.246 – 10.63.15.247	10.63.15.247
29	10.63.15.248/31	10.63.15.248 – 10.63.15.249	10.63.15.249
30	10.63.15.250/31	10.63.15.250 – 10.63.15.251	10.63.15.251
31	10.63.15.252/31	10.63.15.252 – 10.63.15.253	10.63.15.253
32	10.63.15.254/31	10.63.15.254 – 10.63.15.255	10.63.15.255

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 →