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)10.72.201.0/24

network10.72.201.0/24

broadcast10.72.201.255

first host10.72.201.1

last host10.72.201.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.72.201.0/24

address00001010.01001000.11001001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001000.11001001.00000000

broadcast00001010.01001000.11001001.11111111

green = network part, grey = host part

hex0x0a48c900

decimal172542208

reverse dns0.201.72.10.in-addr.arpa

ipv4-mapped::ffff:a48:c900

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.72.201.0/30	10.72.201.1 – 10.72.201.2	10.72.201.3
2	10.72.201.4/30	10.72.201.5 – 10.72.201.6	10.72.201.7
3	10.72.201.8/30	10.72.201.9 – 10.72.201.10	10.72.201.11
4	10.72.201.12/30	10.72.201.13 – 10.72.201.14	10.72.201.15
5	10.72.201.16/30	10.72.201.17 – 10.72.201.18	10.72.201.19
6	10.72.201.20/30	10.72.201.21 – 10.72.201.22	10.72.201.23
7	10.72.201.24/30	10.72.201.25 – 10.72.201.26	10.72.201.27
8	10.72.201.28/30	10.72.201.29 – 10.72.201.30	10.72.201.31
9	10.72.201.32/30	10.72.201.33 – 10.72.201.34	10.72.201.35
10	10.72.201.36/30	10.72.201.37 – 10.72.201.38	10.72.201.39
11	10.72.201.40/30	10.72.201.41 – 10.72.201.42	10.72.201.43
12	10.72.201.44/30	10.72.201.45 – 10.72.201.46	10.72.201.47
13	10.72.201.48/30	10.72.201.49 – 10.72.201.50	10.72.201.51
14	10.72.201.52/30	10.72.201.53 – 10.72.201.54	10.72.201.55
15	10.72.201.56/30	10.72.201.57 – 10.72.201.58	10.72.201.59
16	10.72.201.60/30	10.72.201.61 – 10.72.201.62	10.72.201.63
17	10.72.201.64/30	10.72.201.65 – 10.72.201.66	10.72.201.67
18	10.72.201.68/30	10.72.201.69 – 10.72.201.70	10.72.201.71
19	10.72.201.72/30	10.72.201.73 – 10.72.201.74	10.72.201.75
20	10.72.201.76/30	10.72.201.77 – 10.72.201.78	10.72.201.79
21	10.72.201.80/30	10.72.201.81 – 10.72.201.82	10.72.201.83
22	10.72.201.84/30	10.72.201.85 – 10.72.201.86	10.72.201.87
23	10.72.201.88/30	10.72.201.89 – 10.72.201.90	10.72.201.91
24	10.72.201.92/30	10.72.201.93 – 10.72.201.94	10.72.201.95
25	10.72.201.96/30	10.72.201.97 – 10.72.201.98	10.72.201.99
26	10.72.201.100/30	10.72.201.101 – 10.72.201.102	10.72.201.103
27	10.72.201.104/30	10.72.201.105 – 10.72.201.106	10.72.201.107
28	10.72.201.108/30	10.72.201.109 – 10.72.201.110	10.72.201.111
29	10.72.201.112/30	10.72.201.113 – 10.72.201.114	10.72.201.115
30	10.72.201.116/30	10.72.201.117 – 10.72.201.118	10.72.201.119
31	10.72.201.120/30	10.72.201.121 – 10.72.201.122	10.72.201.123
32	10.72.201.124/30	10.72.201.125 – 10.72.201.126	10.72.201.127
33	10.72.201.128/30	10.72.201.129 – 10.72.201.130	10.72.201.131
34	10.72.201.132/30	10.72.201.133 – 10.72.201.134	10.72.201.135
35	10.72.201.136/30	10.72.201.137 – 10.72.201.138	10.72.201.139
36	10.72.201.140/30	10.72.201.141 – 10.72.201.142	10.72.201.143
37	10.72.201.144/30	10.72.201.145 – 10.72.201.146	10.72.201.147
38	10.72.201.148/30	10.72.201.149 – 10.72.201.150	10.72.201.151
39	10.72.201.152/30	10.72.201.153 – 10.72.201.154	10.72.201.155
40	10.72.201.156/30	10.72.201.157 – 10.72.201.158	10.72.201.159
41	10.72.201.160/30	10.72.201.161 – 10.72.201.162	10.72.201.163
42	10.72.201.164/30	10.72.201.165 – 10.72.201.166	10.72.201.167
43	10.72.201.168/30	10.72.201.169 – 10.72.201.170	10.72.201.171
44	10.72.201.172/30	10.72.201.173 – 10.72.201.174	10.72.201.175
45	10.72.201.176/30	10.72.201.177 – 10.72.201.178	10.72.201.179
46	10.72.201.180/30	10.72.201.181 – 10.72.201.182	10.72.201.183
47	10.72.201.184/30	10.72.201.185 – 10.72.201.186	10.72.201.187
48	10.72.201.188/30	10.72.201.189 – 10.72.201.190	10.72.201.191
49	10.72.201.192/30	10.72.201.193 – 10.72.201.194	10.72.201.195
50	10.72.201.196/30	10.72.201.197 – 10.72.201.198	10.72.201.199
51	10.72.201.200/30	10.72.201.201 – 10.72.201.202	10.72.201.203
52	10.72.201.204/30	10.72.201.205 – 10.72.201.206	10.72.201.207
53	10.72.201.208/30	10.72.201.209 – 10.72.201.210	10.72.201.211
54	10.72.201.212/30	10.72.201.213 – 10.72.201.214	10.72.201.215
55	10.72.201.216/30	10.72.201.217 – 10.72.201.218	10.72.201.219
56	10.72.201.220/30	10.72.201.221 – 10.72.201.222	10.72.201.223
57	10.72.201.224/30	10.72.201.225 – 10.72.201.226	10.72.201.227
58	10.72.201.228/30	10.72.201.229 – 10.72.201.230	10.72.201.231
59	10.72.201.232/30	10.72.201.233 – 10.72.201.234	10.72.201.235
60	10.72.201.236/30	10.72.201.237 – 10.72.201.238	10.72.201.239
61	10.72.201.240/30	10.72.201.241 – 10.72.201.242	10.72.201.243
62	10.72.201.244/30	10.72.201.245 – 10.72.201.246	10.72.201.247
63	10.72.201.248/30	10.72.201.249 – 10.72.201.250	10.72.201.251
64	10.72.201.252/30	10.72.201.253 – 10.72.201.254	10.72.201.255

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 →