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)10.167.15.192/27

network10.167.15.192/27

broadcast10.167.15.223

first host10.167.15.193

last host10.167.15.222

subnet mask255.255.255.224

wildcard0.0.0.31

addresses32

usable hosts30

classA

ipcalc 10.167.15.192/27

address00001010.10100111.00001111.11000000

subnet mask11111111.11111111.11111111.11100000

network00001010.10100111.00001111.11000000

broadcast00001010.10100111.00001111.11011111

green = network part, grey = host part

hex0x0aa70fc0

decimal178720704

reverse dns192.15.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:fc0

/27 split into /32 · 32 subnets

close ×

#	network	host range	broadcast
1	10.167.15.192/32	10.167.15.192 – 10.167.15.192	10.167.15.192
2	10.167.15.193/32	10.167.15.193 – 10.167.15.193	10.167.15.193
3	10.167.15.194/32	10.167.15.194 – 10.167.15.194	10.167.15.194
4	10.167.15.195/32	10.167.15.195 – 10.167.15.195	10.167.15.195
5	10.167.15.196/32	10.167.15.196 – 10.167.15.196	10.167.15.196
6	10.167.15.197/32	10.167.15.197 – 10.167.15.197	10.167.15.197
7	10.167.15.198/32	10.167.15.198 – 10.167.15.198	10.167.15.198
8	10.167.15.199/32	10.167.15.199 – 10.167.15.199	10.167.15.199
9	10.167.15.200/32	10.167.15.200 – 10.167.15.200	10.167.15.200
10	10.167.15.201/32	10.167.15.201 – 10.167.15.201	10.167.15.201
11	10.167.15.202/32	10.167.15.202 – 10.167.15.202	10.167.15.202
12	10.167.15.203/32	10.167.15.203 – 10.167.15.203	10.167.15.203
13	10.167.15.204/32	10.167.15.204 – 10.167.15.204	10.167.15.204
14	10.167.15.205/32	10.167.15.205 – 10.167.15.205	10.167.15.205
15	10.167.15.206/32	10.167.15.206 – 10.167.15.206	10.167.15.206
16	10.167.15.207/32	10.167.15.207 – 10.167.15.207	10.167.15.207
17	10.167.15.208/32	10.167.15.208 – 10.167.15.208	10.167.15.208
18	10.167.15.209/32	10.167.15.209 – 10.167.15.209	10.167.15.209
19	10.167.15.210/32	10.167.15.210 – 10.167.15.210	10.167.15.210
20	10.167.15.211/32	10.167.15.211 – 10.167.15.211	10.167.15.211
21	10.167.15.212/32	10.167.15.212 – 10.167.15.212	10.167.15.212
22	10.167.15.213/32	10.167.15.213 – 10.167.15.213	10.167.15.213
23	10.167.15.214/32	10.167.15.214 – 10.167.15.214	10.167.15.214
24	10.167.15.215/32	10.167.15.215 – 10.167.15.215	10.167.15.215
25	10.167.15.216/32	10.167.15.216 – 10.167.15.216	10.167.15.216
26	10.167.15.217/32	10.167.15.217 – 10.167.15.217	10.167.15.217
27	10.167.15.218/32	10.167.15.218 – 10.167.15.218	10.167.15.218
28	10.167.15.219/32	10.167.15.219 – 10.167.15.219	10.167.15.219
29	10.167.15.220/32	10.167.15.220 – 10.167.15.220	10.167.15.220
30	10.167.15.221/32	10.167.15.221 – 10.167.15.221	10.167.15.221
31	10.167.15.222/32	10.167.15.222 – 10.167.15.222	10.167.15.222
32	10.167.15.223/32	10.167.15.223 – 10.167.15.223	10.167.15.223

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 →