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)10.167.16.0/24

network10.167.16.0/24

broadcast10.167.16.255

first host10.167.16.1

last host10.167.16.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.16.0/24

address00001010.10100111.00010000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.00010000.00000000

broadcast00001010.10100111.00010000.11111111

green = network part, grey = host part

hex0x0aa71000

decimal178720768

reverse dns0.16.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:1000

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.16.0/30	10.167.16.1 – 10.167.16.2	10.167.16.3
2	10.167.16.4/30	10.167.16.5 – 10.167.16.6	10.167.16.7
3	10.167.16.8/30	10.167.16.9 – 10.167.16.10	10.167.16.11
4	10.167.16.12/30	10.167.16.13 – 10.167.16.14	10.167.16.15
5	10.167.16.16/30	10.167.16.17 – 10.167.16.18	10.167.16.19
6	10.167.16.20/30	10.167.16.21 – 10.167.16.22	10.167.16.23
7	10.167.16.24/30	10.167.16.25 – 10.167.16.26	10.167.16.27
8	10.167.16.28/30	10.167.16.29 – 10.167.16.30	10.167.16.31
9	10.167.16.32/30	10.167.16.33 – 10.167.16.34	10.167.16.35
10	10.167.16.36/30	10.167.16.37 – 10.167.16.38	10.167.16.39
11	10.167.16.40/30	10.167.16.41 – 10.167.16.42	10.167.16.43
12	10.167.16.44/30	10.167.16.45 – 10.167.16.46	10.167.16.47
13	10.167.16.48/30	10.167.16.49 – 10.167.16.50	10.167.16.51
14	10.167.16.52/30	10.167.16.53 – 10.167.16.54	10.167.16.55
15	10.167.16.56/30	10.167.16.57 – 10.167.16.58	10.167.16.59
16	10.167.16.60/30	10.167.16.61 – 10.167.16.62	10.167.16.63
17	10.167.16.64/30	10.167.16.65 – 10.167.16.66	10.167.16.67
18	10.167.16.68/30	10.167.16.69 – 10.167.16.70	10.167.16.71
19	10.167.16.72/30	10.167.16.73 – 10.167.16.74	10.167.16.75
20	10.167.16.76/30	10.167.16.77 – 10.167.16.78	10.167.16.79
21	10.167.16.80/30	10.167.16.81 – 10.167.16.82	10.167.16.83
22	10.167.16.84/30	10.167.16.85 – 10.167.16.86	10.167.16.87
23	10.167.16.88/30	10.167.16.89 – 10.167.16.90	10.167.16.91
24	10.167.16.92/30	10.167.16.93 – 10.167.16.94	10.167.16.95
25	10.167.16.96/30	10.167.16.97 – 10.167.16.98	10.167.16.99
26	10.167.16.100/30	10.167.16.101 – 10.167.16.102	10.167.16.103
27	10.167.16.104/30	10.167.16.105 – 10.167.16.106	10.167.16.107
28	10.167.16.108/30	10.167.16.109 – 10.167.16.110	10.167.16.111
29	10.167.16.112/30	10.167.16.113 – 10.167.16.114	10.167.16.115
30	10.167.16.116/30	10.167.16.117 – 10.167.16.118	10.167.16.119
31	10.167.16.120/30	10.167.16.121 – 10.167.16.122	10.167.16.123
32	10.167.16.124/30	10.167.16.125 – 10.167.16.126	10.167.16.127
33	10.167.16.128/30	10.167.16.129 – 10.167.16.130	10.167.16.131
34	10.167.16.132/30	10.167.16.133 – 10.167.16.134	10.167.16.135
35	10.167.16.136/30	10.167.16.137 – 10.167.16.138	10.167.16.139
36	10.167.16.140/30	10.167.16.141 – 10.167.16.142	10.167.16.143
37	10.167.16.144/30	10.167.16.145 – 10.167.16.146	10.167.16.147
38	10.167.16.148/30	10.167.16.149 – 10.167.16.150	10.167.16.151
39	10.167.16.152/30	10.167.16.153 – 10.167.16.154	10.167.16.155
40	10.167.16.156/30	10.167.16.157 – 10.167.16.158	10.167.16.159
41	10.167.16.160/30	10.167.16.161 – 10.167.16.162	10.167.16.163
42	10.167.16.164/30	10.167.16.165 – 10.167.16.166	10.167.16.167
43	10.167.16.168/30	10.167.16.169 – 10.167.16.170	10.167.16.171
44	10.167.16.172/30	10.167.16.173 – 10.167.16.174	10.167.16.175
45	10.167.16.176/30	10.167.16.177 – 10.167.16.178	10.167.16.179
46	10.167.16.180/30	10.167.16.181 – 10.167.16.182	10.167.16.183
47	10.167.16.184/30	10.167.16.185 – 10.167.16.186	10.167.16.187
48	10.167.16.188/30	10.167.16.189 – 10.167.16.190	10.167.16.191
49	10.167.16.192/30	10.167.16.193 – 10.167.16.194	10.167.16.195
50	10.167.16.196/30	10.167.16.197 – 10.167.16.198	10.167.16.199
51	10.167.16.200/30	10.167.16.201 – 10.167.16.202	10.167.16.203
52	10.167.16.204/30	10.167.16.205 – 10.167.16.206	10.167.16.207
53	10.167.16.208/30	10.167.16.209 – 10.167.16.210	10.167.16.211
54	10.167.16.212/30	10.167.16.213 – 10.167.16.214	10.167.16.215
55	10.167.16.216/30	10.167.16.217 – 10.167.16.218	10.167.16.219
56	10.167.16.220/30	10.167.16.221 – 10.167.16.222	10.167.16.223
57	10.167.16.224/30	10.167.16.225 – 10.167.16.226	10.167.16.227
58	10.167.16.228/30	10.167.16.229 – 10.167.16.230	10.167.16.231
59	10.167.16.232/30	10.167.16.233 – 10.167.16.234	10.167.16.235
60	10.167.16.236/30	10.167.16.237 – 10.167.16.238	10.167.16.239
61	10.167.16.240/30	10.167.16.241 – 10.167.16.242	10.167.16.243
62	10.167.16.244/30	10.167.16.245 – 10.167.16.246	10.167.16.247
63	10.167.16.248/30	10.167.16.249 – 10.167.16.250	10.167.16.251
64	10.167.16.252/30	10.167.16.253 – 10.167.16.254	10.167.16.255

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 →