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)10.31.167.0/24

network10.31.167.0/24

broadcast10.31.167.255

first host10.31.167.1

last host10.31.167.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.31.167.0/24

address00001010.00011111.10100111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00011111.10100111.00000000

broadcast00001010.00011111.10100111.11111111

green = network part, grey = host part

hex0x0a1fa700

decimal169846528

reverse dns0.167.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:a700

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.31.167.0/30	10.31.167.1 – 10.31.167.2	10.31.167.3
2	10.31.167.4/30	10.31.167.5 – 10.31.167.6	10.31.167.7
3	10.31.167.8/30	10.31.167.9 – 10.31.167.10	10.31.167.11
4	10.31.167.12/30	10.31.167.13 – 10.31.167.14	10.31.167.15
5	10.31.167.16/30	10.31.167.17 – 10.31.167.18	10.31.167.19
6	10.31.167.20/30	10.31.167.21 – 10.31.167.22	10.31.167.23
7	10.31.167.24/30	10.31.167.25 – 10.31.167.26	10.31.167.27
8	10.31.167.28/30	10.31.167.29 – 10.31.167.30	10.31.167.31
9	10.31.167.32/30	10.31.167.33 – 10.31.167.34	10.31.167.35
10	10.31.167.36/30	10.31.167.37 – 10.31.167.38	10.31.167.39
11	10.31.167.40/30	10.31.167.41 – 10.31.167.42	10.31.167.43
12	10.31.167.44/30	10.31.167.45 – 10.31.167.46	10.31.167.47
13	10.31.167.48/30	10.31.167.49 – 10.31.167.50	10.31.167.51
14	10.31.167.52/30	10.31.167.53 – 10.31.167.54	10.31.167.55
15	10.31.167.56/30	10.31.167.57 – 10.31.167.58	10.31.167.59
16	10.31.167.60/30	10.31.167.61 – 10.31.167.62	10.31.167.63
17	10.31.167.64/30	10.31.167.65 – 10.31.167.66	10.31.167.67
18	10.31.167.68/30	10.31.167.69 – 10.31.167.70	10.31.167.71
19	10.31.167.72/30	10.31.167.73 – 10.31.167.74	10.31.167.75
20	10.31.167.76/30	10.31.167.77 – 10.31.167.78	10.31.167.79
21	10.31.167.80/30	10.31.167.81 – 10.31.167.82	10.31.167.83
22	10.31.167.84/30	10.31.167.85 – 10.31.167.86	10.31.167.87
23	10.31.167.88/30	10.31.167.89 – 10.31.167.90	10.31.167.91
24	10.31.167.92/30	10.31.167.93 – 10.31.167.94	10.31.167.95
25	10.31.167.96/30	10.31.167.97 – 10.31.167.98	10.31.167.99
26	10.31.167.100/30	10.31.167.101 – 10.31.167.102	10.31.167.103
27	10.31.167.104/30	10.31.167.105 – 10.31.167.106	10.31.167.107
28	10.31.167.108/30	10.31.167.109 – 10.31.167.110	10.31.167.111
29	10.31.167.112/30	10.31.167.113 – 10.31.167.114	10.31.167.115
30	10.31.167.116/30	10.31.167.117 – 10.31.167.118	10.31.167.119
31	10.31.167.120/30	10.31.167.121 – 10.31.167.122	10.31.167.123
32	10.31.167.124/30	10.31.167.125 – 10.31.167.126	10.31.167.127
33	10.31.167.128/30	10.31.167.129 – 10.31.167.130	10.31.167.131
34	10.31.167.132/30	10.31.167.133 – 10.31.167.134	10.31.167.135
35	10.31.167.136/30	10.31.167.137 – 10.31.167.138	10.31.167.139
36	10.31.167.140/30	10.31.167.141 – 10.31.167.142	10.31.167.143
37	10.31.167.144/30	10.31.167.145 – 10.31.167.146	10.31.167.147
38	10.31.167.148/30	10.31.167.149 – 10.31.167.150	10.31.167.151
39	10.31.167.152/30	10.31.167.153 – 10.31.167.154	10.31.167.155
40	10.31.167.156/30	10.31.167.157 – 10.31.167.158	10.31.167.159
41	10.31.167.160/30	10.31.167.161 – 10.31.167.162	10.31.167.163
42	10.31.167.164/30	10.31.167.165 – 10.31.167.166	10.31.167.167
43	10.31.167.168/30	10.31.167.169 – 10.31.167.170	10.31.167.171
44	10.31.167.172/30	10.31.167.173 – 10.31.167.174	10.31.167.175
45	10.31.167.176/30	10.31.167.177 – 10.31.167.178	10.31.167.179
46	10.31.167.180/30	10.31.167.181 – 10.31.167.182	10.31.167.183
47	10.31.167.184/30	10.31.167.185 – 10.31.167.186	10.31.167.187
48	10.31.167.188/30	10.31.167.189 – 10.31.167.190	10.31.167.191
49	10.31.167.192/30	10.31.167.193 – 10.31.167.194	10.31.167.195
50	10.31.167.196/30	10.31.167.197 – 10.31.167.198	10.31.167.199
51	10.31.167.200/30	10.31.167.201 – 10.31.167.202	10.31.167.203
52	10.31.167.204/30	10.31.167.205 – 10.31.167.206	10.31.167.207
53	10.31.167.208/30	10.31.167.209 – 10.31.167.210	10.31.167.211
54	10.31.167.212/30	10.31.167.213 – 10.31.167.214	10.31.167.215
55	10.31.167.216/30	10.31.167.217 – 10.31.167.218	10.31.167.219
56	10.31.167.220/30	10.31.167.221 – 10.31.167.222	10.31.167.223
57	10.31.167.224/30	10.31.167.225 – 10.31.167.226	10.31.167.227
58	10.31.167.228/30	10.31.167.229 – 10.31.167.230	10.31.167.231
59	10.31.167.232/30	10.31.167.233 – 10.31.167.234	10.31.167.235
60	10.31.167.236/30	10.31.167.237 – 10.31.167.238	10.31.167.239
61	10.31.167.240/30	10.31.167.241 – 10.31.167.242	10.31.167.243
62	10.31.167.244/30	10.31.167.245 – 10.31.167.246	10.31.167.247
63	10.31.167.248/30	10.31.167.249 – 10.31.167.250	10.31.167.251
64	10.31.167.252/30	10.31.167.253 – 10.31.167.254	10.31.167.255

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 →