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)10.167.127.0/24

network10.167.127.0/24

broadcast10.167.127.255

first host10.167.127.1

last host10.167.127.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.127.0/24

address00001010.10100111.01111111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.01111111.00000000

broadcast00001010.10100111.01111111.11111111

green = network part, grey = host part

hex0x0aa77f00

decimal178749184

reverse dns0.127.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:7f00

/24 split into /29 · 32 subnets

close ×

#	network	host range	broadcast
1	10.167.127.0/29	10.167.127.1 – 10.167.127.6	10.167.127.7
2	10.167.127.8/29	10.167.127.9 – 10.167.127.14	10.167.127.15
3	10.167.127.16/29	10.167.127.17 – 10.167.127.22	10.167.127.23
4	10.167.127.24/29	10.167.127.25 – 10.167.127.30	10.167.127.31
5	10.167.127.32/29	10.167.127.33 – 10.167.127.38	10.167.127.39
6	10.167.127.40/29	10.167.127.41 – 10.167.127.46	10.167.127.47
7	10.167.127.48/29	10.167.127.49 – 10.167.127.54	10.167.127.55
8	10.167.127.56/29	10.167.127.57 – 10.167.127.62	10.167.127.63
9	10.167.127.64/29	10.167.127.65 – 10.167.127.70	10.167.127.71
10	10.167.127.72/29	10.167.127.73 – 10.167.127.78	10.167.127.79
11	10.167.127.80/29	10.167.127.81 – 10.167.127.86	10.167.127.87
12	10.167.127.88/29	10.167.127.89 – 10.167.127.94	10.167.127.95
13	10.167.127.96/29	10.167.127.97 – 10.167.127.102	10.167.127.103
14	10.167.127.104/29	10.167.127.105 – 10.167.127.110	10.167.127.111
15	10.167.127.112/29	10.167.127.113 – 10.167.127.118	10.167.127.119
16	10.167.127.120/29	10.167.127.121 – 10.167.127.126	10.167.127.127
17	10.167.127.128/29	10.167.127.129 – 10.167.127.134	10.167.127.135
18	10.167.127.136/29	10.167.127.137 – 10.167.127.142	10.167.127.143
19	10.167.127.144/29	10.167.127.145 – 10.167.127.150	10.167.127.151
20	10.167.127.152/29	10.167.127.153 – 10.167.127.158	10.167.127.159
21	10.167.127.160/29	10.167.127.161 – 10.167.127.166	10.167.127.167
22	10.167.127.168/29	10.167.127.169 – 10.167.127.174	10.167.127.175
23	10.167.127.176/29	10.167.127.177 – 10.167.127.182	10.167.127.183
24	10.167.127.184/29	10.167.127.185 – 10.167.127.190	10.167.127.191
25	10.167.127.192/29	10.167.127.193 – 10.167.127.198	10.167.127.199
26	10.167.127.200/29	10.167.127.201 – 10.167.127.206	10.167.127.207
27	10.167.127.208/29	10.167.127.209 – 10.167.127.214	10.167.127.215
28	10.167.127.216/29	10.167.127.217 – 10.167.127.222	10.167.127.223
29	10.167.127.224/29	10.167.127.225 – 10.167.127.230	10.167.127.231
30	10.167.127.232/29	10.167.127.233 – 10.167.127.238	10.167.127.239
31	10.167.127.240/29	10.167.127.241 – 10.167.127.246	10.167.127.247
32	10.167.127.248/29	10.167.127.249 – 10.167.127.254	10.167.127.255

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 →