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)10.167.123.0/24

network10.167.123.0/24

broadcast10.167.123.255

first host10.167.123.1

last host10.167.123.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.123.0/24

address00001010.10100111.01111011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.01111011.00000000

broadcast00001010.10100111.01111011.11111111

green = network part, grey = host part

hex0x0aa77b00

decimal178748160

reverse dns0.123.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:7b00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.123.0/30	10.167.123.1 – 10.167.123.2	10.167.123.3
2	10.167.123.4/30	10.167.123.5 – 10.167.123.6	10.167.123.7
3	10.167.123.8/30	10.167.123.9 – 10.167.123.10	10.167.123.11
4	10.167.123.12/30	10.167.123.13 – 10.167.123.14	10.167.123.15
5	10.167.123.16/30	10.167.123.17 – 10.167.123.18	10.167.123.19
6	10.167.123.20/30	10.167.123.21 – 10.167.123.22	10.167.123.23
7	10.167.123.24/30	10.167.123.25 – 10.167.123.26	10.167.123.27
8	10.167.123.28/30	10.167.123.29 – 10.167.123.30	10.167.123.31
9	10.167.123.32/30	10.167.123.33 – 10.167.123.34	10.167.123.35
10	10.167.123.36/30	10.167.123.37 – 10.167.123.38	10.167.123.39
11	10.167.123.40/30	10.167.123.41 – 10.167.123.42	10.167.123.43
12	10.167.123.44/30	10.167.123.45 – 10.167.123.46	10.167.123.47
13	10.167.123.48/30	10.167.123.49 – 10.167.123.50	10.167.123.51
14	10.167.123.52/30	10.167.123.53 – 10.167.123.54	10.167.123.55
15	10.167.123.56/30	10.167.123.57 – 10.167.123.58	10.167.123.59
16	10.167.123.60/30	10.167.123.61 – 10.167.123.62	10.167.123.63
17	10.167.123.64/30	10.167.123.65 – 10.167.123.66	10.167.123.67
18	10.167.123.68/30	10.167.123.69 – 10.167.123.70	10.167.123.71
19	10.167.123.72/30	10.167.123.73 – 10.167.123.74	10.167.123.75
20	10.167.123.76/30	10.167.123.77 – 10.167.123.78	10.167.123.79
21	10.167.123.80/30	10.167.123.81 – 10.167.123.82	10.167.123.83
22	10.167.123.84/30	10.167.123.85 – 10.167.123.86	10.167.123.87
23	10.167.123.88/30	10.167.123.89 – 10.167.123.90	10.167.123.91
24	10.167.123.92/30	10.167.123.93 – 10.167.123.94	10.167.123.95
25	10.167.123.96/30	10.167.123.97 – 10.167.123.98	10.167.123.99
26	10.167.123.100/30	10.167.123.101 – 10.167.123.102	10.167.123.103
27	10.167.123.104/30	10.167.123.105 – 10.167.123.106	10.167.123.107
28	10.167.123.108/30	10.167.123.109 – 10.167.123.110	10.167.123.111
29	10.167.123.112/30	10.167.123.113 – 10.167.123.114	10.167.123.115
30	10.167.123.116/30	10.167.123.117 – 10.167.123.118	10.167.123.119
31	10.167.123.120/30	10.167.123.121 – 10.167.123.122	10.167.123.123
32	10.167.123.124/30	10.167.123.125 – 10.167.123.126	10.167.123.127
33	10.167.123.128/30	10.167.123.129 – 10.167.123.130	10.167.123.131
34	10.167.123.132/30	10.167.123.133 – 10.167.123.134	10.167.123.135
35	10.167.123.136/30	10.167.123.137 – 10.167.123.138	10.167.123.139
36	10.167.123.140/30	10.167.123.141 – 10.167.123.142	10.167.123.143
37	10.167.123.144/30	10.167.123.145 – 10.167.123.146	10.167.123.147
38	10.167.123.148/30	10.167.123.149 – 10.167.123.150	10.167.123.151
39	10.167.123.152/30	10.167.123.153 – 10.167.123.154	10.167.123.155
40	10.167.123.156/30	10.167.123.157 – 10.167.123.158	10.167.123.159
41	10.167.123.160/30	10.167.123.161 – 10.167.123.162	10.167.123.163
42	10.167.123.164/30	10.167.123.165 – 10.167.123.166	10.167.123.167
43	10.167.123.168/30	10.167.123.169 – 10.167.123.170	10.167.123.171
44	10.167.123.172/30	10.167.123.173 – 10.167.123.174	10.167.123.175
45	10.167.123.176/30	10.167.123.177 – 10.167.123.178	10.167.123.179
46	10.167.123.180/30	10.167.123.181 – 10.167.123.182	10.167.123.183
47	10.167.123.184/30	10.167.123.185 – 10.167.123.186	10.167.123.187
48	10.167.123.188/30	10.167.123.189 – 10.167.123.190	10.167.123.191
49	10.167.123.192/30	10.167.123.193 – 10.167.123.194	10.167.123.195
50	10.167.123.196/30	10.167.123.197 – 10.167.123.198	10.167.123.199
51	10.167.123.200/30	10.167.123.201 – 10.167.123.202	10.167.123.203
52	10.167.123.204/30	10.167.123.205 – 10.167.123.206	10.167.123.207
53	10.167.123.208/30	10.167.123.209 – 10.167.123.210	10.167.123.211
54	10.167.123.212/30	10.167.123.213 – 10.167.123.214	10.167.123.215
55	10.167.123.216/30	10.167.123.217 – 10.167.123.218	10.167.123.219
56	10.167.123.220/30	10.167.123.221 – 10.167.123.222	10.167.123.223
57	10.167.123.224/30	10.167.123.225 – 10.167.123.226	10.167.123.227
58	10.167.123.228/30	10.167.123.229 – 10.167.123.230	10.167.123.231
59	10.167.123.232/30	10.167.123.233 – 10.167.123.234	10.167.123.235
60	10.167.123.236/30	10.167.123.237 – 10.167.123.238	10.167.123.239
61	10.167.123.240/30	10.167.123.241 – 10.167.123.242	10.167.123.243
62	10.167.123.244/30	10.167.123.245 – 10.167.123.246	10.167.123.247
63	10.167.123.248/30	10.167.123.249 – 10.167.123.250	10.167.123.251
64	10.167.123.252/30	10.167.123.253 – 10.167.123.254	10.167.123.255

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 →