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)10.136.37.0/24

network10.136.37.0/24

broadcast10.136.37.255

first host10.136.37.1

last host10.136.37.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.136.37.0/24

address00001010.10001000.00100101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10001000.00100101.00000000

broadcast00001010.10001000.00100101.11111111

green = network part, grey = host part

hex0x0a882500

decimal176694528

reverse dns0.37.136.10.in-addr.arpa

ipv4-mapped::ffff:a88:2500

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.136.37.0/30	10.136.37.1 – 10.136.37.2	10.136.37.3
2	10.136.37.4/30	10.136.37.5 – 10.136.37.6	10.136.37.7
3	10.136.37.8/30	10.136.37.9 – 10.136.37.10	10.136.37.11
4	10.136.37.12/30	10.136.37.13 – 10.136.37.14	10.136.37.15
5	10.136.37.16/30	10.136.37.17 – 10.136.37.18	10.136.37.19
6	10.136.37.20/30	10.136.37.21 – 10.136.37.22	10.136.37.23
7	10.136.37.24/30	10.136.37.25 – 10.136.37.26	10.136.37.27
8	10.136.37.28/30	10.136.37.29 – 10.136.37.30	10.136.37.31
9	10.136.37.32/30	10.136.37.33 – 10.136.37.34	10.136.37.35
10	10.136.37.36/30	10.136.37.37 – 10.136.37.38	10.136.37.39
11	10.136.37.40/30	10.136.37.41 – 10.136.37.42	10.136.37.43
12	10.136.37.44/30	10.136.37.45 – 10.136.37.46	10.136.37.47
13	10.136.37.48/30	10.136.37.49 – 10.136.37.50	10.136.37.51
14	10.136.37.52/30	10.136.37.53 – 10.136.37.54	10.136.37.55
15	10.136.37.56/30	10.136.37.57 – 10.136.37.58	10.136.37.59
16	10.136.37.60/30	10.136.37.61 – 10.136.37.62	10.136.37.63
17	10.136.37.64/30	10.136.37.65 – 10.136.37.66	10.136.37.67
18	10.136.37.68/30	10.136.37.69 – 10.136.37.70	10.136.37.71
19	10.136.37.72/30	10.136.37.73 – 10.136.37.74	10.136.37.75
20	10.136.37.76/30	10.136.37.77 – 10.136.37.78	10.136.37.79
21	10.136.37.80/30	10.136.37.81 – 10.136.37.82	10.136.37.83
22	10.136.37.84/30	10.136.37.85 – 10.136.37.86	10.136.37.87
23	10.136.37.88/30	10.136.37.89 – 10.136.37.90	10.136.37.91
24	10.136.37.92/30	10.136.37.93 – 10.136.37.94	10.136.37.95
25	10.136.37.96/30	10.136.37.97 – 10.136.37.98	10.136.37.99
26	10.136.37.100/30	10.136.37.101 – 10.136.37.102	10.136.37.103
27	10.136.37.104/30	10.136.37.105 – 10.136.37.106	10.136.37.107
28	10.136.37.108/30	10.136.37.109 – 10.136.37.110	10.136.37.111
29	10.136.37.112/30	10.136.37.113 – 10.136.37.114	10.136.37.115
30	10.136.37.116/30	10.136.37.117 – 10.136.37.118	10.136.37.119
31	10.136.37.120/30	10.136.37.121 – 10.136.37.122	10.136.37.123
32	10.136.37.124/30	10.136.37.125 – 10.136.37.126	10.136.37.127
33	10.136.37.128/30	10.136.37.129 – 10.136.37.130	10.136.37.131
34	10.136.37.132/30	10.136.37.133 – 10.136.37.134	10.136.37.135
35	10.136.37.136/30	10.136.37.137 – 10.136.37.138	10.136.37.139
36	10.136.37.140/30	10.136.37.141 – 10.136.37.142	10.136.37.143
37	10.136.37.144/30	10.136.37.145 – 10.136.37.146	10.136.37.147
38	10.136.37.148/30	10.136.37.149 – 10.136.37.150	10.136.37.151
39	10.136.37.152/30	10.136.37.153 – 10.136.37.154	10.136.37.155
40	10.136.37.156/30	10.136.37.157 – 10.136.37.158	10.136.37.159
41	10.136.37.160/30	10.136.37.161 – 10.136.37.162	10.136.37.163
42	10.136.37.164/30	10.136.37.165 – 10.136.37.166	10.136.37.167
43	10.136.37.168/30	10.136.37.169 – 10.136.37.170	10.136.37.171
44	10.136.37.172/30	10.136.37.173 – 10.136.37.174	10.136.37.175
45	10.136.37.176/30	10.136.37.177 – 10.136.37.178	10.136.37.179
46	10.136.37.180/30	10.136.37.181 – 10.136.37.182	10.136.37.183
47	10.136.37.184/30	10.136.37.185 – 10.136.37.186	10.136.37.187
48	10.136.37.188/30	10.136.37.189 – 10.136.37.190	10.136.37.191
49	10.136.37.192/30	10.136.37.193 – 10.136.37.194	10.136.37.195
50	10.136.37.196/30	10.136.37.197 – 10.136.37.198	10.136.37.199
51	10.136.37.200/30	10.136.37.201 – 10.136.37.202	10.136.37.203
52	10.136.37.204/30	10.136.37.205 – 10.136.37.206	10.136.37.207
53	10.136.37.208/30	10.136.37.209 – 10.136.37.210	10.136.37.211
54	10.136.37.212/30	10.136.37.213 – 10.136.37.214	10.136.37.215
55	10.136.37.216/30	10.136.37.217 – 10.136.37.218	10.136.37.219
56	10.136.37.220/30	10.136.37.221 – 10.136.37.222	10.136.37.223
57	10.136.37.224/30	10.136.37.225 – 10.136.37.226	10.136.37.227
58	10.136.37.228/30	10.136.37.229 – 10.136.37.230	10.136.37.231
59	10.136.37.232/30	10.136.37.233 – 10.136.37.234	10.136.37.235
60	10.136.37.236/30	10.136.37.237 – 10.136.37.238	10.136.37.239
61	10.136.37.240/30	10.136.37.241 – 10.136.37.242	10.136.37.243
62	10.136.37.244/30	10.136.37.245 – 10.136.37.246	10.136.37.247
63	10.136.37.248/30	10.136.37.249 – 10.136.37.250	10.136.37.251
64	10.136.37.252/30	10.136.37.253 – 10.136.37.254	10.136.37.255

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 →