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)10.232.72.0/24

network10.232.72.0/24

broadcast10.232.72.255

first host10.232.72.1

last host10.232.72.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.232.72.0/24

address00001010.11101000.01001000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.11101000.01001000.00000000

broadcast00001010.11101000.01001000.11111111

green = network part, grey = host part

hex0x0ae84800

decimal182994944

reverse dns0.72.232.10.in-addr.arpa

ipv4-mapped::ffff:ae8:4800

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.232.72.0/30	10.232.72.1 – 10.232.72.2	10.232.72.3
2	10.232.72.4/30	10.232.72.5 – 10.232.72.6	10.232.72.7
3	10.232.72.8/30	10.232.72.9 – 10.232.72.10	10.232.72.11
4	10.232.72.12/30	10.232.72.13 – 10.232.72.14	10.232.72.15
5	10.232.72.16/30	10.232.72.17 – 10.232.72.18	10.232.72.19
6	10.232.72.20/30	10.232.72.21 – 10.232.72.22	10.232.72.23
7	10.232.72.24/30	10.232.72.25 – 10.232.72.26	10.232.72.27
8	10.232.72.28/30	10.232.72.29 – 10.232.72.30	10.232.72.31
9	10.232.72.32/30	10.232.72.33 – 10.232.72.34	10.232.72.35
10	10.232.72.36/30	10.232.72.37 – 10.232.72.38	10.232.72.39
11	10.232.72.40/30	10.232.72.41 – 10.232.72.42	10.232.72.43
12	10.232.72.44/30	10.232.72.45 – 10.232.72.46	10.232.72.47
13	10.232.72.48/30	10.232.72.49 – 10.232.72.50	10.232.72.51
14	10.232.72.52/30	10.232.72.53 – 10.232.72.54	10.232.72.55
15	10.232.72.56/30	10.232.72.57 – 10.232.72.58	10.232.72.59
16	10.232.72.60/30	10.232.72.61 – 10.232.72.62	10.232.72.63
17	10.232.72.64/30	10.232.72.65 – 10.232.72.66	10.232.72.67
18	10.232.72.68/30	10.232.72.69 – 10.232.72.70	10.232.72.71
19	10.232.72.72/30	10.232.72.73 – 10.232.72.74	10.232.72.75
20	10.232.72.76/30	10.232.72.77 – 10.232.72.78	10.232.72.79
21	10.232.72.80/30	10.232.72.81 – 10.232.72.82	10.232.72.83
22	10.232.72.84/30	10.232.72.85 – 10.232.72.86	10.232.72.87
23	10.232.72.88/30	10.232.72.89 – 10.232.72.90	10.232.72.91
24	10.232.72.92/30	10.232.72.93 – 10.232.72.94	10.232.72.95
25	10.232.72.96/30	10.232.72.97 – 10.232.72.98	10.232.72.99
26	10.232.72.100/30	10.232.72.101 – 10.232.72.102	10.232.72.103
27	10.232.72.104/30	10.232.72.105 – 10.232.72.106	10.232.72.107
28	10.232.72.108/30	10.232.72.109 – 10.232.72.110	10.232.72.111
29	10.232.72.112/30	10.232.72.113 – 10.232.72.114	10.232.72.115
30	10.232.72.116/30	10.232.72.117 – 10.232.72.118	10.232.72.119
31	10.232.72.120/30	10.232.72.121 – 10.232.72.122	10.232.72.123
32	10.232.72.124/30	10.232.72.125 – 10.232.72.126	10.232.72.127
33	10.232.72.128/30	10.232.72.129 – 10.232.72.130	10.232.72.131
34	10.232.72.132/30	10.232.72.133 – 10.232.72.134	10.232.72.135
35	10.232.72.136/30	10.232.72.137 – 10.232.72.138	10.232.72.139
36	10.232.72.140/30	10.232.72.141 – 10.232.72.142	10.232.72.143
37	10.232.72.144/30	10.232.72.145 – 10.232.72.146	10.232.72.147
38	10.232.72.148/30	10.232.72.149 – 10.232.72.150	10.232.72.151
39	10.232.72.152/30	10.232.72.153 – 10.232.72.154	10.232.72.155
40	10.232.72.156/30	10.232.72.157 – 10.232.72.158	10.232.72.159
41	10.232.72.160/30	10.232.72.161 – 10.232.72.162	10.232.72.163
42	10.232.72.164/30	10.232.72.165 – 10.232.72.166	10.232.72.167
43	10.232.72.168/30	10.232.72.169 – 10.232.72.170	10.232.72.171
44	10.232.72.172/30	10.232.72.173 – 10.232.72.174	10.232.72.175
45	10.232.72.176/30	10.232.72.177 – 10.232.72.178	10.232.72.179
46	10.232.72.180/30	10.232.72.181 – 10.232.72.182	10.232.72.183
47	10.232.72.184/30	10.232.72.185 – 10.232.72.186	10.232.72.187
48	10.232.72.188/30	10.232.72.189 – 10.232.72.190	10.232.72.191
49	10.232.72.192/30	10.232.72.193 – 10.232.72.194	10.232.72.195
50	10.232.72.196/30	10.232.72.197 – 10.232.72.198	10.232.72.199
51	10.232.72.200/30	10.232.72.201 – 10.232.72.202	10.232.72.203
52	10.232.72.204/30	10.232.72.205 – 10.232.72.206	10.232.72.207
53	10.232.72.208/30	10.232.72.209 – 10.232.72.210	10.232.72.211
54	10.232.72.212/30	10.232.72.213 – 10.232.72.214	10.232.72.215
55	10.232.72.216/30	10.232.72.217 – 10.232.72.218	10.232.72.219
56	10.232.72.220/30	10.232.72.221 – 10.232.72.222	10.232.72.223
57	10.232.72.224/30	10.232.72.225 – 10.232.72.226	10.232.72.227
58	10.232.72.228/30	10.232.72.229 – 10.232.72.230	10.232.72.231
59	10.232.72.232/30	10.232.72.233 – 10.232.72.234	10.232.72.235
60	10.232.72.236/30	10.232.72.237 – 10.232.72.238	10.232.72.239
61	10.232.72.240/30	10.232.72.241 – 10.232.72.242	10.232.72.243
62	10.232.72.244/30	10.232.72.245 – 10.232.72.246	10.232.72.247
63	10.232.72.248/30	10.232.72.249 – 10.232.72.250	10.232.72.251
64	10.232.72.252/30	10.232.72.253 – 10.232.72.254	10.232.72.255

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 →