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)10.2.162.0/24

network10.2.162.0/24

broadcast10.2.162.255

first host10.2.162.1

last host10.2.162.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.162.0/24

address00001010.00000010.10100010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10100010.00000000

broadcast00001010.00000010.10100010.11111111

green = network part, grey = host part

hex0x0a02a200

decimal167944704

reverse dns0.162.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:a200

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.162.0/30	10.2.162.1 – 10.2.162.2	10.2.162.3
2	10.2.162.4/30	10.2.162.5 – 10.2.162.6	10.2.162.7
3	10.2.162.8/30	10.2.162.9 – 10.2.162.10	10.2.162.11
4	10.2.162.12/30	10.2.162.13 – 10.2.162.14	10.2.162.15
5	10.2.162.16/30	10.2.162.17 – 10.2.162.18	10.2.162.19
6	10.2.162.20/30	10.2.162.21 – 10.2.162.22	10.2.162.23
7	10.2.162.24/30	10.2.162.25 – 10.2.162.26	10.2.162.27
8	10.2.162.28/30	10.2.162.29 – 10.2.162.30	10.2.162.31
9	10.2.162.32/30	10.2.162.33 – 10.2.162.34	10.2.162.35
10	10.2.162.36/30	10.2.162.37 – 10.2.162.38	10.2.162.39
11	10.2.162.40/30	10.2.162.41 – 10.2.162.42	10.2.162.43
12	10.2.162.44/30	10.2.162.45 – 10.2.162.46	10.2.162.47
13	10.2.162.48/30	10.2.162.49 – 10.2.162.50	10.2.162.51
14	10.2.162.52/30	10.2.162.53 – 10.2.162.54	10.2.162.55
15	10.2.162.56/30	10.2.162.57 – 10.2.162.58	10.2.162.59
16	10.2.162.60/30	10.2.162.61 – 10.2.162.62	10.2.162.63
17	10.2.162.64/30	10.2.162.65 – 10.2.162.66	10.2.162.67
18	10.2.162.68/30	10.2.162.69 – 10.2.162.70	10.2.162.71
19	10.2.162.72/30	10.2.162.73 – 10.2.162.74	10.2.162.75
20	10.2.162.76/30	10.2.162.77 – 10.2.162.78	10.2.162.79
21	10.2.162.80/30	10.2.162.81 – 10.2.162.82	10.2.162.83
22	10.2.162.84/30	10.2.162.85 – 10.2.162.86	10.2.162.87
23	10.2.162.88/30	10.2.162.89 – 10.2.162.90	10.2.162.91
24	10.2.162.92/30	10.2.162.93 – 10.2.162.94	10.2.162.95
25	10.2.162.96/30	10.2.162.97 – 10.2.162.98	10.2.162.99
26	10.2.162.100/30	10.2.162.101 – 10.2.162.102	10.2.162.103
27	10.2.162.104/30	10.2.162.105 – 10.2.162.106	10.2.162.107
28	10.2.162.108/30	10.2.162.109 – 10.2.162.110	10.2.162.111
29	10.2.162.112/30	10.2.162.113 – 10.2.162.114	10.2.162.115
30	10.2.162.116/30	10.2.162.117 – 10.2.162.118	10.2.162.119
31	10.2.162.120/30	10.2.162.121 – 10.2.162.122	10.2.162.123
32	10.2.162.124/30	10.2.162.125 – 10.2.162.126	10.2.162.127
33	10.2.162.128/30	10.2.162.129 – 10.2.162.130	10.2.162.131
34	10.2.162.132/30	10.2.162.133 – 10.2.162.134	10.2.162.135
35	10.2.162.136/30	10.2.162.137 – 10.2.162.138	10.2.162.139
36	10.2.162.140/30	10.2.162.141 – 10.2.162.142	10.2.162.143
37	10.2.162.144/30	10.2.162.145 – 10.2.162.146	10.2.162.147
38	10.2.162.148/30	10.2.162.149 – 10.2.162.150	10.2.162.151
39	10.2.162.152/30	10.2.162.153 – 10.2.162.154	10.2.162.155
40	10.2.162.156/30	10.2.162.157 – 10.2.162.158	10.2.162.159
41	10.2.162.160/30	10.2.162.161 – 10.2.162.162	10.2.162.163
42	10.2.162.164/30	10.2.162.165 – 10.2.162.166	10.2.162.167
43	10.2.162.168/30	10.2.162.169 – 10.2.162.170	10.2.162.171
44	10.2.162.172/30	10.2.162.173 – 10.2.162.174	10.2.162.175
45	10.2.162.176/30	10.2.162.177 – 10.2.162.178	10.2.162.179
46	10.2.162.180/30	10.2.162.181 – 10.2.162.182	10.2.162.183
47	10.2.162.184/30	10.2.162.185 – 10.2.162.186	10.2.162.187
48	10.2.162.188/30	10.2.162.189 – 10.2.162.190	10.2.162.191
49	10.2.162.192/30	10.2.162.193 – 10.2.162.194	10.2.162.195
50	10.2.162.196/30	10.2.162.197 – 10.2.162.198	10.2.162.199
51	10.2.162.200/30	10.2.162.201 – 10.2.162.202	10.2.162.203
52	10.2.162.204/30	10.2.162.205 – 10.2.162.206	10.2.162.207
53	10.2.162.208/30	10.2.162.209 – 10.2.162.210	10.2.162.211
54	10.2.162.212/30	10.2.162.213 – 10.2.162.214	10.2.162.215
55	10.2.162.216/30	10.2.162.217 – 10.2.162.218	10.2.162.219
56	10.2.162.220/30	10.2.162.221 – 10.2.162.222	10.2.162.223
57	10.2.162.224/30	10.2.162.225 – 10.2.162.226	10.2.162.227
58	10.2.162.228/30	10.2.162.229 – 10.2.162.230	10.2.162.231
59	10.2.162.232/30	10.2.162.233 – 10.2.162.234	10.2.162.235
60	10.2.162.236/30	10.2.162.237 – 10.2.162.238	10.2.162.239
61	10.2.162.240/30	10.2.162.241 – 10.2.162.242	10.2.162.243
62	10.2.162.244/30	10.2.162.245 – 10.2.162.246	10.2.162.247
63	10.2.162.248/30	10.2.162.249 – 10.2.162.250	10.2.162.251
64	10.2.162.252/30	10.2.162.253 – 10.2.162.254	10.2.162.255

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 →