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)10.131.1.0/24

network10.131.1.0/24

broadcast10.131.1.255

first host10.131.1.1

last host10.131.1.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.131.1.0/24

address00001010.10000011.00000001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000011.00000001.00000000

broadcast00001010.10000011.00000001.11111111

green = network part, grey = host part

hex0x0a830100

decimal176357632

reverse dns0.1.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:100

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.1.0/30	10.131.1.1 – 10.131.1.2	10.131.1.3
2	10.131.1.4/30	10.131.1.5 – 10.131.1.6	10.131.1.7
3	10.131.1.8/30	10.131.1.9 – 10.131.1.10	10.131.1.11
4	10.131.1.12/30	10.131.1.13 – 10.131.1.14	10.131.1.15
5	10.131.1.16/30	10.131.1.17 – 10.131.1.18	10.131.1.19
6	10.131.1.20/30	10.131.1.21 – 10.131.1.22	10.131.1.23
7	10.131.1.24/30	10.131.1.25 – 10.131.1.26	10.131.1.27
8	10.131.1.28/30	10.131.1.29 – 10.131.1.30	10.131.1.31
9	10.131.1.32/30	10.131.1.33 – 10.131.1.34	10.131.1.35
10	10.131.1.36/30	10.131.1.37 – 10.131.1.38	10.131.1.39
11	10.131.1.40/30	10.131.1.41 – 10.131.1.42	10.131.1.43
12	10.131.1.44/30	10.131.1.45 – 10.131.1.46	10.131.1.47
13	10.131.1.48/30	10.131.1.49 – 10.131.1.50	10.131.1.51
14	10.131.1.52/30	10.131.1.53 – 10.131.1.54	10.131.1.55
15	10.131.1.56/30	10.131.1.57 – 10.131.1.58	10.131.1.59
16	10.131.1.60/30	10.131.1.61 – 10.131.1.62	10.131.1.63
17	10.131.1.64/30	10.131.1.65 – 10.131.1.66	10.131.1.67
18	10.131.1.68/30	10.131.1.69 – 10.131.1.70	10.131.1.71
19	10.131.1.72/30	10.131.1.73 – 10.131.1.74	10.131.1.75
20	10.131.1.76/30	10.131.1.77 – 10.131.1.78	10.131.1.79
21	10.131.1.80/30	10.131.1.81 – 10.131.1.82	10.131.1.83
22	10.131.1.84/30	10.131.1.85 – 10.131.1.86	10.131.1.87
23	10.131.1.88/30	10.131.1.89 – 10.131.1.90	10.131.1.91
24	10.131.1.92/30	10.131.1.93 – 10.131.1.94	10.131.1.95
25	10.131.1.96/30	10.131.1.97 – 10.131.1.98	10.131.1.99
26	10.131.1.100/30	10.131.1.101 – 10.131.1.102	10.131.1.103
27	10.131.1.104/30	10.131.1.105 – 10.131.1.106	10.131.1.107
28	10.131.1.108/30	10.131.1.109 – 10.131.1.110	10.131.1.111
29	10.131.1.112/30	10.131.1.113 – 10.131.1.114	10.131.1.115
30	10.131.1.116/30	10.131.1.117 – 10.131.1.118	10.131.1.119
31	10.131.1.120/30	10.131.1.121 – 10.131.1.122	10.131.1.123
32	10.131.1.124/30	10.131.1.125 – 10.131.1.126	10.131.1.127
33	10.131.1.128/30	10.131.1.129 – 10.131.1.130	10.131.1.131
34	10.131.1.132/30	10.131.1.133 – 10.131.1.134	10.131.1.135
35	10.131.1.136/30	10.131.1.137 – 10.131.1.138	10.131.1.139
36	10.131.1.140/30	10.131.1.141 – 10.131.1.142	10.131.1.143
37	10.131.1.144/30	10.131.1.145 – 10.131.1.146	10.131.1.147
38	10.131.1.148/30	10.131.1.149 – 10.131.1.150	10.131.1.151
39	10.131.1.152/30	10.131.1.153 – 10.131.1.154	10.131.1.155
40	10.131.1.156/30	10.131.1.157 – 10.131.1.158	10.131.1.159
41	10.131.1.160/30	10.131.1.161 – 10.131.1.162	10.131.1.163
42	10.131.1.164/30	10.131.1.165 – 10.131.1.166	10.131.1.167
43	10.131.1.168/30	10.131.1.169 – 10.131.1.170	10.131.1.171
44	10.131.1.172/30	10.131.1.173 – 10.131.1.174	10.131.1.175
45	10.131.1.176/30	10.131.1.177 – 10.131.1.178	10.131.1.179
46	10.131.1.180/30	10.131.1.181 – 10.131.1.182	10.131.1.183
47	10.131.1.184/30	10.131.1.185 – 10.131.1.186	10.131.1.187
48	10.131.1.188/30	10.131.1.189 – 10.131.1.190	10.131.1.191
49	10.131.1.192/30	10.131.1.193 – 10.131.1.194	10.131.1.195
50	10.131.1.196/30	10.131.1.197 – 10.131.1.198	10.131.1.199
51	10.131.1.200/30	10.131.1.201 – 10.131.1.202	10.131.1.203
52	10.131.1.204/30	10.131.1.205 – 10.131.1.206	10.131.1.207
53	10.131.1.208/30	10.131.1.209 – 10.131.1.210	10.131.1.211
54	10.131.1.212/30	10.131.1.213 – 10.131.1.214	10.131.1.215
55	10.131.1.216/30	10.131.1.217 – 10.131.1.218	10.131.1.219
56	10.131.1.220/30	10.131.1.221 – 10.131.1.222	10.131.1.223
57	10.131.1.224/30	10.131.1.225 – 10.131.1.226	10.131.1.227
58	10.131.1.228/30	10.131.1.229 – 10.131.1.230	10.131.1.231
59	10.131.1.232/30	10.131.1.233 – 10.131.1.234	10.131.1.235
60	10.131.1.236/30	10.131.1.237 – 10.131.1.238	10.131.1.239
61	10.131.1.240/30	10.131.1.241 – 10.131.1.242	10.131.1.243
62	10.131.1.244/30	10.131.1.245 – 10.131.1.246	10.131.1.247
63	10.131.1.248/30	10.131.1.249 – 10.131.1.250	10.131.1.251
64	10.131.1.252/30	10.131.1.253 – 10.131.1.254	10.131.1.255

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 →