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)10.91.167.0/24

network10.91.167.0/24

broadcast10.91.167.255

first host10.91.167.1

last host10.91.167.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.91.167.0/24

address00001010.01011011.10100111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01011011.10100111.00000000

broadcast00001010.01011011.10100111.11111111

green = network part, grey = host part

hex0x0a5ba700

decimal173778688

reverse dns0.167.91.10.in-addr.arpa

ipv4-mapped::ffff:a5b:a700

/24 split into /29 · 32 subnets

close ×

#	network	host range	broadcast
1	10.91.167.0/29	10.91.167.1 – 10.91.167.6	10.91.167.7
2	10.91.167.8/29	10.91.167.9 – 10.91.167.14	10.91.167.15
3	10.91.167.16/29	10.91.167.17 – 10.91.167.22	10.91.167.23
4	10.91.167.24/29	10.91.167.25 – 10.91.167.30	10.91.167.31
5	10.91.167.32/29	10.91.167.33 – 10.91.167.38	10.91.167.39
6	10.91.167.40/29	10.91.167.41 – 10.91.167.46	10.91.167.47
7	10.91.167.48/29	10.91.167.49 – 10.91.167.54	10.91.167.55
8	10.91.167.56/29	10.91.167.57 – 10.91.167.62	10.91.167.63
9	10.91.167.64/29	10.91.167.65 – 10.91.167.70	10.91.167.71
10	10.91.167.72/29	10.91.167.73 – 10.91.167.78	10.91.167.79
11	10.91.167.80/29	10.91.167.81 – 10.91.167.86	10.91.167.87
12	10.91.167.88/29	10.91.167.89 – 10.91.167.94	10.91.167.95
13	10.91.167.96/29	10.91.167.97 – 10.91.167.102	10.91.167.103
14	10.91.167.104/29	10.91.167.105 – 10.91.167.110	10.91.167.111
15	10.91.167.112/29	10.91.167.113 – 10.91.167.118	10.91.167.119
16	10.91.167.120/29	10.91.167.121 – 10.91.167.126	10.91.167.127
17	10.91.167.128/29	10.91.167.129 – 10.91.167.134	10.91.167.135
18	10.91.167.136/29	10.91.167.137 – 10.91.167.142	10.91.167.143
19	10.91.167.144/29	10.91.167.145 – 10.91.167.150	10.91.167.151
20	10.91.167.152/29	10.91.167.153 – 10.91.167.158	10.91.167.159
21	10.91.167.160/29	10.91.167.161 – 10.91.167.166	10.91.167.167
22	10.91.167.168/29	10.91.167.169 – 10.91.167.174	10.91.167.175
23	10.91.167.176/29	10.91.167.177 – 10.91.167.182	10.91.167.183
24	10.91.167.184/29	10.91.167.185 – 10.91.167.190	10.91.167.191
25	10.91.167.192/29	10.91.167.193 – 10.91.167.198	10.91.167.199
26	10.91.167.200/29	10.91.167.201 – 10.91.167.206	10.91.167.207
27	10.91.167.208/29	10.91.167.209 – 10.91.167.214	10.91.167.215
28	10.91.167.216/29	10.91.167.217 – 10.91.167.222	10.91.167.223
29	10.91.167.224/29	10.91.167.225 – 10.91.167.230	10.91.167.231
30	10.91.167.232/29	10.91.167.233 – 10.91.167.238	10.91.167.239
31	10.91.167.240/29	10.91.167.241 – 10.91.167.246	10.91.167.247
32	10.91.167.248/29	10.91.167.249 – 10.91.167.254	10.91.167.255

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 /24
/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	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →