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)10.0.10.192/27

network10.0.10.192/27

broadcast10.0.10.223

first host10.0.10.193

last host10.0.10.222

subnet mask255.255.255.224

wildcard0.0.0.31

addresses32

usable hosts30

classA

ipcalc 10.0.10.192/27

address00001010.00000000.00001010.11000000

subnet mask11111111.11111111.11111111.11100000

network00001010.00000000.00001010.11000000

broadcast00001010.00000000.00001010.11011111

green = network part, grey = host part

hex0x0a000ac0

decimal167774912

reverse dns192.10.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:ac0

/27 split into /32 · 32 subnets

close ×

#	network	host range	broadcast
1	10.0.10.192/32	10.0.10.192 – 10.0.10.192	10.0.10.192
2	10.0.10.193/32	10.0.10.193 – 10.0.10.193	10.0.10.193
3	10.0.10.194/32	10.0.10.194 – 10.0.10.194	10.0.10.194
4	10.0.10.195/32	10.0.10.195 – 10.0.10.195	10.0.10.195
5	10.0.10.196/32	10.0.10.196 – 10.0.10.196	10.0.10.196
6	10.0.10.197/32	10.0.10.197 – 10.0.10.197	10.0.10.197
7	10.0.10.198/32	10.0.10.198 – 10.0.10.198	10.0.10.198
8	10.0.10.199/32	10.0.10.199 – 10.0.10.199	10.0.10.199
9	10.0.10.200/32	10.0.10.200 – 10.0.10.200	10.0.10.200
10	10.0.10.201/32	10.0.10.201 – 10.0.10.201	10.0.10.201
11	10.0.10.202/32	10.0.10.202 – 10.0.10.202	10.0.10.202
12	10.0.10.203/32	10.0.10.203 – 10.0.10.203	10.0.10.203
13	10.0.10.204/32	10.0.10.204 – 10.0.10.204	10.0.10.204
14	10.0.10.205/32	10.0.10.205 – 10.0.10.205	10.0.10.205
15	10.0.10.206/32	10.0.10.206 – 10.0.10.206	10.0.10.206
16	10.0.10.207/32	10.0.10.207 – 10.0.10.207	10.0.10.207
17	10.0.10.208/32	10.0.10.208 – 10.0.10.208	10.0.10.208
18	10.0.10.209/32	10.0.10.209 – 10.0.10.209	10.0.10.209
19	10.0.10.210/32	10.0.10.210 – 10.0.10.210	10.0.10.210
20	10.0.10.211/32	10.0.10.211 – 10.0.10.211	10.0.10.211
21	10.0.10.212/32	10.0.10.212 – 10.0.10.212	10.0.10.212
22	10.0.10.213/32	10.0.10.213 – 10.0.10.213	10.0.10.213
23	10.0.10.214/32	10.0.10.214 – 10.0.10.214	10.0.10.214
24	10.0.10.215/32	10.0.10.215 – 10.0.10.215	10.0.10.215
25	10.0.10.216/32	10.0.10.216 – 10.0.10.216	10.0.10.216
26	10.0.10.217/32	10.0.10.217 – 10.0.10.217	10.0.10.217
27	10.0.10.218/32	10.0.10.218 – 10.0.10.218	10.0.10.218
28	10.0.10.219/32	10.0.10.219 – 10.0.10.219	10.0.10.219
29	10.0.10.220/32	10.0.10.220 – 10.0.10.220	10.0.10.220
30	10.0.10.221/32	10.0.10.221 – 10.0.10.221	10.0.10.221
31	10.0.10.222/32	10.0.10.222 – 10.0.10.222	10.0.10.222
32	10.0.10.223/32	10.0.10.223 – 10.0.10.223	10.0.10.223

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