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)10.167.156.0/24

network10.167.156.0/24

broadcast10.167.156.255

first host10.167.156.1

last host10.167.156.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.156.0/24

address00001010.10100111.10011100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.10011100.00000000

broadcast00001010.10100111.10011100.11111111

green = network part, grey = host part

hex0x0aa79c00

decimal178756608

reverse dns0.156.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:9c00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.156.0/30	10.167.156.1 – 10.167.156.2	10.167.156.3
2	10.167.156.4/30	10.167.156.5 – 10.167.156.6	10.167.156.7
3	10.167.156.8/30	10.167.156.9 – 10.167.156.10	10.167.156.11
4	10.167.156.12/30	10.167.156.13 – 10.167.156.14	10.167.156.15
5	10.167.156.16/30	10.167.156.17 – 10.167.156.18	10.167.156.19
6	10.167.156.20/30	10.167.156.21 – 10.167.156.22	10.167.156.23
7	10.167.156.24/30	10.167.156.25 – 10.167.156.26	10.167.156.27
8	10.167.156.28/30	10.167.156.29 – 10.167.156.30	10.167.156.31
9	10.167.156.32/30	10.167.156.33 – 10.167.156.34	10.167.156.35
10	10.167.156.36/30	10.167.156.37 – 10.167.156.38	10.167.156.39
11	10.167.156.40/30	10.167.156.41 – 10.167.156.42	10.167.156.43
12	10.167.156.44/30	10.167.156.45 – 10.167.156.46	10.167.156.47
13	10.167.156.48/30	10.167.156.49 – 10.167.156.50	10.167.156.51
14	10.167.156.52/30	10.167.156.53 – 10.167.156.54	10.167.156.55
15	10.167.156.56/30	10.167.156.57 – 10.167.156.58	10.167.156.59
16	10.167.156.60/30	10.167.156.61 – 10.167.156.62	10.167.156.63
17	10.167.156.64/30	10.167.156.65 – 10.167.156.66	10.167.156.67
18	10.167.156.68/30	10.167.156.69 – 10.167.156.70	10.167.156.71
19	10.167.156.72/30	10.167.156.73 – 10.167.156.74	10.167.156.75
20	10.167.156.76/30	10.167.156.77 – 10.167.156.78	10.167.156.79
21	10.167.156.80/30	10.167.156.81 – 10.167.156.82	10.167.156.83
22	10.167.156.84/30	10.167.156.85 – 10.167.156.86	10.167.156.87
23	10.167.156.88/30	10.167.156.89 – 10.167.156.90	10.167.156.91
24	10.167.156.92/30	10.167.156.93 – 10.167.156.94	10.167.156.95
25	10.167.156.96/30	10.167.156.97 – 10.167.156.98	10.167.156.99
26	10.167.156.100/30	10.167.156.101 – 10.167.156.102	10.167.156.103
27	10.167.156.104/30	10.167.156.105 – 10.167.156.106	10.167.156.107
28	10.167.156.108/30	10.167.156.109 – 10.167.156.110	10.167.156.111
29	10.167.156.112/30	10.167.156.113 – 10.167.156.114	10.167.156.115
30	10.167.156.116/30	10.167.156.117 – 10.167.156.118	10.167.156.119
31	10.167.156.120/30	10.167.156.121 – 10.167.156.122	10.167.156.123
32	10.167.156.124/30	10.167.156.125 – 10.167.156.126	10.167.156.127
33	10.167.156.128/30	10.167.156.129 – 10.167.156.130	10.167.156.131
34	10.167.156.132/30	10.167.156.133 – 10.167.156.134	10.167.156.135
35	10.167.156.136/30	10.167.156.137 – 10.167.156.138	10.167.156.139
36	10.167.156.140/30	10.167.156.141 – 10.167.156.142	10.167.156.143
37	10.167.156.144/30	10.167.156.145 – 10.167.156.146	10.167.156.147
38	10.167.156.148/30	10.167.156.149 – 10.167.156.150	10.167.156.151
39	10.167.156.152/30	10.167.156.153 – 10.167.156.154	10.167.156.155
40	10.167.156.156/30	10.167.156.157 – 10.167.156.158	10.167.156.159
41	10.167.156.160/30	10.167.156.161 – 10.167.156.162	10.167.156.163
42	10.167.156.164/30	10.167.156.165 – 10.167.156.166	10.167.156.167
43	10.167.156.168/30	10.167.156.169 – 10.167.156.170	10.167.156.171
44	10.167.156.172/30	10.167.156.173 – 10.167.156.174	10.167.156.175
45	10.167.156.176/30	10.167.156.177 – 10.167.156.178	10.167.156.179
46	10.167.156.180/30	10.167.156.181 – 10.167.156.182	10.167.156.183
47	10.167.156.184/30	10.167.156.185 – 10.167.156.186	10.167.156.187
48	10.167.156.188/30	10.167.156.189 – 10.167.156.190	10.167.156.191
49	10.167.156.192/30	10.167.156.193 – 10.167.156.194	10.167.156.195
50	10.167.156.196/30	10.167.156.197 – 10.167.156.198	10.167.156.199
51	10.167.156.200/30	10.167.156.201 – 10.167.156.202	10.167.156.203
52	10.167.156.204/30	10.167.156.205 – 10.167.156.206	10.167.156.207
53	10.167.156.208/30	10.167.156.209 – 10.167.156.210	10.167.156.211
54	10.167.156.212/30	10.167.156.213 – 10.167.156.214	10.167.156.215
55	10.167.156.216/30	10.167.156.217 – 10.167.156.218	10.167.156.219
56	10.167.156.220/30	10.167.156.221 – 10.167.156.222	10.167.156.223
57	10.167.156.224/30	10.167.156.225 – 10.167.156.226	10.167.156.227
58	10.167.156.228/30	10.167.156.229 – 10.167.156.230	10.167.156.231
59	10.167.156.232/30	10.167.156.233 – 10.167.156.234	10.167.156.235
60	10.167.156.236/30	10.167.156.237 – 10.167.156.238	10.167.156.239
61	10.167.156.240/30	10.167.156.241 – 10.167.156.242	10.167.156.243
62	10.167.156.244/30	10.167.156.245 – 10.167.156.246	10.167.156.247
63	10.167.156.248/30	10.167.156.249 – 10.167.156.250	10.167.156.251
64	10.167.156.252/30	10.167.156.253 – 10.167.156.254	10.167.156.255

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 →