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)10.131.22.0/23

network10.131.22.0/23

broadcast10.131.23.255

first host10.131.22.1

last host10.131.23.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.131.22.0/23

address00001010.10000011.00010110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10000011.00010110.00000000

broadcast00001010.10000011.00010111.11111111

green = network part, grey = host part

hex0x0a831600

decimal176363008

reverse dns0.22.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:1600

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.22.0/29	10.131.22.1 – 10.131.22.6	10.131.22.7
2	10.131.22.8/29	10.131.22.9 – 10.131.22.14	10.131.22.15
3	10.131.22.16/29	10.131.22.17 – 10.131.22.22	10.131.22.23
4	10.131.22.24/29	10.131.22.25 – 10.131.22.30	10.131.22.31
5	10.131.22.32/29	10.131.22.33 – 10.131.22.38	10.131.22.39
6	10.131.22.40/29	10.131.22.41 – 10.131.22.46	10.131.22.47
7	10.131.22.48/29	10.131.22.49 – 10.131.22.54	10.131.22.55
8	10.131.22.56/29	10.131.22.57 – 10.131.22.62	10.131.22.63
9	10.131.22.64/29	10.131.22.65 – 10.131.22.70	10.131.22.71
10	10.131.22.72/29	10.131.22.73 – 10.131.22.78	10.131.22.79
11	10.131.22.80/29	10.131.22.81 – 10.131.22.86	10.131.22.87
12	10.131.22.88/29	10.131.22.89 – 10.131.22.94	10.131.22.95
13	10.131.22.96/29	10.131.22.97 – 10.131.22.102	10.131.22.103
14	10.131.22.104/29	10.131.22.105 – 10.131.22.110	10.131.22.111
15	10.131.22.112/29	10.131.22.113 – 10.131.22.118	10.131.22.119
16	10.131.22.120/29	10.131.22.121 – 10.131.22.126	10.131.22.127
17	10.131.22.128/29	10.131.22.129 – 10.131.22.134	10.131.22.135
18	10.131.22.136/29	10.131.22.137 – 10.131.22.142	10.131.22.143
19	10.131.22.144/29	10.131.22.145 – 10.131.22.150	10.131.22.151
20	10.131.22.152/29	10.131.22.153 – 10.131.22.158	10.131.22.159
21	10.131.22.160/29	10.131.22.161 – 10.131.22.166	10.131.22.167
22	10.131.22.168/29	10.131.22.169 – 10.131.22.174	10.131.22.175
23	10.131.22.176/29	10.131.22.177 – 10.131.22.182	10.131.22.183
24	10.131.22.184/29	10.131.22.185 – 10.131.22.190	10.131.22.191
25	10.131.22.192/29	10.131.22.193 – 10.131.22.198	10.131.22.199
26	10.131.22.200/29	10.131.22.201 – 10.131.22.206	10.131.22.207
27	10.131.22.208/29	10.131.22.209 – 10.131.22.214	10.131.22.215
28	10.131.22.216/29	10.131.22.217 – 10.131.22.222	10.131.22.223
29	10.131.22.224/29	10.131.22.225 – 10.131.22.230	10.131.22.231
30	10.131.22.232/29	10.131.22.233 – 10.131.22.238	10.131.22.239
31	10.131.22.240/29	10.131.22.241 – 10.131.22.246	10.131.22.247
32	10.131.22.248/29	10.131.22.249 – 10.131.22.254	10.131.22.255
33	10.131.23.0/29	10.131.23.1 – 10.131.23.6	10.131.23.7
34	10.131.23.8/29	10.131.23.9 – 10.131.23.14	10.131.23.15
35	10.131.23.16/29	10.131.23.17 – 10.131.23.22	10.131.23.23
36	10.131.23.24/29	10.131.23.25 – 10.131.23.30	10.131.23.31
37	10.131.23.32/29	10.131.23.33 – 10.131.23.38	10.131.23.39
38	10.131.23.40/29	10.131.23.41 – 10.131.23.46	10.131.23.47
39	10.131.23.48/29	10.131.23.49 – 10.131.23.54	10.131.23.55
40	10.131.23.56/29	10.131.23.57 – 10.131.23.62	10.131.23.63
41	10.131.23.64/29	10.131.23.65 – 10.131.23.70	10.131.23.71
42	10.131.23.72/29	10.131.23.73 – 10.131.23.78	10.131.23.79
43	10.131.23.80/29	10.131.23.81 – 10.131.23.86	10.131.23.87
44	10.131.23.88/29	10.131.23.89 – 10.131.23.94	10.131.23.95
45	10.131.23.96/29	10.131.23.97 – 10.131.23.102	10.131.23.103
46	10.131.23.104/29	10.131.23.105 – 10.131.23.110	10.131.23.111
47	10.131.23.112/29	10.131.23.113 – 10.131.23.118	10.131.23.119
48	10.131.23.120/29	10.131.23.121 – 10.131.23.126	10.131.23.127
49	10.131.23.128/29	10.131.23.129 – 10.131.23.134	10.131.23.135
50	10.131.23.136/29	10.131.23.137 – 10.131.23.142	10.131.23.143
51	10.131.23.144/29	10.131.23.145 – 10.131.23.150	10.131.23.151
52	10.131.23.152/29	10.131.23.153 – 10.131.23.158	10.131.23.159
53	10.131.23.160/29	10.131.23.161 – 10.131.23.166	10.131.23.167
54	10.131.23.168/29	10.131.23.169 – 10.131.23.174	10.131.23.175
55	10.131.23.176/29	10.131.23.177 – 10.131.23.182	10.131.23.183
56	10.131.23.184/29	10.131.23.185 – 10.131.23.190	10.131.23.191
57	10.131.23.192/29	10.131.23.193 – 10.131.23.198	10.131.23.199
58	10.131.23.200/29	10.131.23.201 – 10.131.23.206	10.131.23.207
59	10.131.23.208/29	10.131.23.209 – 10.131.23.214	10.131.23.215
60	10.131.23.216/29	10.131.23.217 – 10.131.23.222	10.131.23.223
61	10.131.23.224/29	10.131.23.225 – 10.131.23.230	10.131.23.231
62	10.131.23.232/29	10.131.23.233 – 10.131.23.238	10.131.23.239
63	10.131.23.240/29	10.131.23.241 – 10.131.23.246	10.131.23.247
64	10.131.23.248/29	10.131.23.249 – 10.131.23.254	10.131.23.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →