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)10.131.22.0/24

network10.131.22.0/24

broadcast10.131.22.255

first host10.131.22.1

last host10.131.22.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.131.22.0/24

address00001010.10000011.00010110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000011.00010110.00000000

broadcast00001010.10000011.00010110.11111111

green = network part, grey = host part

hex0x0a831600

decimal176363008

reverse dns0.22.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:1600

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.22.0/30	10.131.22.1 – 10.131.22.2	10.131.22.3
2	10.131.22.4/30	10.131.22.5 – 10.131.22.6	10.131.22.7
3	10.131.22.8/30	10.131.22.9 – 10.131.22.10	10.131.22.11
4	10.131.22.12/30	10.131.22.13 – 10.131.22.14	10.131.22.15
5	10.131.22.16/30	10.131.22.17 – 10.131.22.18	10.131.22.19
6	10.131.22.20/30	10.131.22.21 – 10.131.22.22	10.131.22.23
7	10.131.22.24/30	10.131.22.25 – 10.131.22.26	10.131.22.27
8	10.131.22.28/30	10.131.22.29 – 10.131.22.30	10.131.22.31
9	10.131.22.32/30	10.131.22.33 – 10.131.22.34	10.131.22.35
10	10.131.22.36/30	10.131.22.37 – 10.131.22.38	10.131.22.39
11	10.131.22.40/30	10.131.22.41 – 10.131.22.42	10.131.22.43
12	10.131.22.44/30	10.131.22.45 – 10.131.22.46	10.131.22.47
13	10.131.22.48/30	10.131.22.49 – 10.131.22.50	10.131.22.51
14	10.131.22.52/30	10.131.22.53 – 10.131.22.54	10.131.22.55
15	10.131.22.56/30	10.131.22.57 – 10.131.22.58	10.131.22.59
16	10.131.22.60/30	10.131.22.61 – 10.131.22.62	10.131.22.63
17	10.131.22.64/30	10.131.22.65 – 10.131.22.66	10.131.22.67
18	10.131.22.68/30	10.131.22.69 – 10.131.22.70	10.131.22.71
19	10.131.22.72/30	10.131.22.73 – 10.131.22.74	10.131.22.75
20	10.131.22.76/30	10.131.22.77 – 10.131.22.78	10.131.22.79
21	10.131.22.80/30	10.131.22.81 – 10.131.22.82	10.131.22.83
22	10.131.22.84/30	10.131.22.85 – 10.131.22.86	10.131.22.87
23	10.131.22.88/30	10.131.22.89 – 10.131.22.90	10.131.22.91
24	10.131.22.92/30	10.131.22.93 – 10.131.22.94	10.131.22.95
25	10.131.22.96/30	10.131.22.97 – 10.131.22.98	10.131.22.99
26	10.131.22.100/30	10.131.22.101 – 10.131.22.102	10.131.22.103
27	10.131.22.104/30	10.131.22.105 – 10.131.22.106	10.131.22.107
28	10.131.22.108/30	10.131.22.109 – 10.131.22.110	10.131.22.111
29	10.131.22.112/30	10.131.22.113 – 10.131.22.114	10.131.22.115
30	10.131.22.116/30	10.131.22.117 – 10.131.22.118	10.131.22.119
31	10.131.22.120/30	10.131.22.121 – 10.131.22.122	10.131.22.123
32	10.131.22.124/30	10.131.22.125 – 10.131.22.126	10.131.22.127
33	10.131.22.128/30	10.131.22.129 – 10.131.22.130	10.131.22.131
34	10.131.22.132/30	10.131.22.133 – 10.131.22.134	10.131.22.135
35	10.131.22.136/30	10.131.22.137 – 10.131.22.138	10.131.22.139
36	10.131.22.140/30	10.131.22.141 – 10.131.22.142	10.131.22.143
37	10.131.22.144/30	10.131.22.145 – 10.131.22.146	10.131.22.147
38	10.131.22.148/30	10.131.22.149 – 10.131.22.150	10.131.22.151
39	10.131.22.152/30	10.131.22.153 – 10.131.22.154	10.131.22.155
40	10.131.22.156/30	10.131.22.157 – 10.131.22.158	10.131.22.159
41	10.131.22.160/30	10.131.22.161 – 10.131.22.162	10.131.22.163
42	10.131.22.164/30	10.131.22.165 – 10.131.22.166	10.131.22.167
43	10.131.22.168/30	10.131.22.169 – 10.131.22.170	10.131.22.171
44	10.131.22.172/30	10.131.22.173 – 10.131.22.174	10.131.22.175
45	10.131.22.176/30	10.131.22.177 – 10.131.22.178	10.131.22.179
46	10.131.22.180/30	10.131.22.181 – 10.131.22.182	10.131.22.183
47	10.131.22.184/30	10.131.22.185 – 10.131.22.186	10.131.22.187
48	10.131.22.188/30	10.131.22.189 – 10.131.22.190	10.131.22.191
49	10.131.22.192/30	10.131.22.193 – 10.131.22.194	10.131.22.195
50	10.131.22.196/30	10.131.22.197 – 10.131.22.198	10.131.22.199
51	10.131.22.200/30	10.131.22.201 – 10.131.22.202	10.131.22.203
52	10.131.22.204/30	10.131.22.205 – 10.131.22.206	10.131.22.207
53	10.131.22.208/30	10.131.22.209 – 10.131.22.210	10.131.22.211
54	10.131.22.212/30	10.131.22.213 – 10.131.22.214	10.131.22.215
55	10.131.22.216/30	10.131.22.217 – 10.131.22.218	10.131.22.219
56	10.131.22.220/30	10.131.22.221 – 10.131.22.222	10.131.22.223
57	10.131.22.224/30	10.131.22.225 – 10.131.22.226	10.131.22.227
58	10.131.22.228/30	10.131.22.229 – 10.131.22.230	10.131.22.231
59	10.131.22.232/30	10.131.22.233 – 10.131.22.234	10.131.22.235
60	10.131.22.236/30	10.131.22.237 – 10.131.22.238	10.131.22.239
61	10.131.22.240/30	10.131.22.241 – 10.131.22.242	10.131.22.243
62	10.131.22.244/30	10.131.22.245 – 10.131.22.246	10.131.22.247
63	10.131.22.248/30	10.131.22.249 – 10.131.22.250	10.131.22.251
64	10.131.22.252/30	10.131.22.253 – 10.131.22.254	10.131.22.255

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 →