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)10.131.185.0/24

network10.131.185.0/24

broadcast10.131.185.255

first host10.131.185.1

last host10.131.185.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.131.185.0/24

address00001010.10000011.10111001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000011.10111001.00000000

broadcast00001010.10000011.10111001.11111111

green = network part, grey = host part

hex0x0a83b900

decimal176404736

reverse dns0.185.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:b900

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.185.0/30	10.131.185.1 – 10.131.185.2	10.131.185.3
2	10.131.185.4/30	10.131.185.5 – 10.131.185.6	10.131.185.7
3	10.131.185.8/30	10.131.185.9 – 10.131.185.10	10.131.185.11
4	10.131.185.12/30	10.131.185.13 – 10.131.185.14	10.131.185.15
5	10.131.185.16/30	10.131.185.17 – 10.131.185.18	10.131.185.19
6	10.131.185.20/30	10.131.185.21 – 10.131.185.22	10.131.185.23
7	10.131.185.24/30	10.131.185.25 – 10.131.185.26	10.131.185.27
8	10.131.185.28/30	10.131.185.29 – 10.131.185.30	10.131.185.31
9	10.131.185.32/30	10.131.185.33 – 10.131.185.34	10.131.185.35
10	10.131.185.36/30	10.131.185.37 – 10.131.185.38	10.131.185.39
11	10.131.185.40/30	10.131.185.41 – 10.131.185.42	10.131.185.43
12	10.131.185.44/30	10.131.185.45 – 10.131.185.46	10.131.185.47
13	10.131.185.48/30	10.131.185.49 – 10.131.185.50	10.131.185.51
14	10.131.185.52/30	10.131.185.53 – 10.131.185.54	10.131.185.55
15	10.131.185.56/30	10.131.185.57 – 10.131.185.58	10.131.185.59
16	10.131.185.60/30	10.131.185.61 – 10.131.185.62	10.131.185.63
17	10.131.185.64/30	10.131.185.65 – 10.131.185.66	10.131.185.67
18	10.131.185.68/30	10.131.185.69 – 10.131.185.70	10.131.185.71
19	10.131.185.72/30	10.131.185.73 – 10.131.185.74	10.131.185.75
20	10.131.185.76/30	10.131.185.77 – 10.131.185.78	10.131.185.79
21	10.131.185.80/30	10.131.185.81 – 10.131.185.82	10.131.185.83
22	10.131.185.84/30	10.131.185.85 – 10.131.185.86	10.131.185.87
23	10.131.185.88/30	10.131.185.89 – 10.131.185.90	10.131.185.91
24	10.131.185.92/30	10.131.185.93 – 10.131.185.94	10.131.185.95
25	10.131.185.96/30	10.131.185.97 – 10.131.185.98	10.131.185.99
26	10.131.185.100/30	10.131.185.101 – 10.131.185.102	10.131.185.103
27	10.131.185.104/30	10.131.185.105 – 10.131.185.106	10.131.185.107
28	10.131.185.108/30	10.131.185.109 – 10.131.185.110	10.131.185.111
29	10.131.185.112/30	10.131.185.113 – 10.131.185.114	10.131.185.115
30	10.131.185.116/30	10.131.185.117 – 10.131.185.118	10.131.185.119
31	10.131.185.120/30	10.131.185.121 – 10.131.185.122	10.131.185.123
32	10.131.185.124/30	10.131.185.125 – 10.131.185.126	10.131.185.127
33	10.131.185.128/30	10.131.185.129 – 10.131.185.130	10.131.185.131
34	10.131.185.132/30	10.131.185.133 – 10.131.185.134	10.131.185.135
35	10.131.185.136/30	10.131.185.137 – 10.131.185.138	10.131.185.139
36	10.131.185.140/30	10.131.185.141 – 10.131.185.142	10.131.185.143
37	10.131.185.144/30	10.131.185.145 – 10.131.185.146	10.131.185.147
38	10.131.185.148/30	10.131.185.149 – 10.131.185.150	10.131.185.151
39	10.131.185.152/30	10.131.185.153 – 10.131.185.154	10.131.185.155
40	10.131.185.156/30	10.131.185.157 – 10.131.185.158	10.131.185.159
41	10.131.185.160/30	10.131.185.161 – 10.131.185.162	10.131.185.163
42	10.131.185.164/30	10.131.185.165 – 10.131.185.166	10.131.185.167
43	10.131.185.168/30	10.131.185.169 – 10.131.185.170	10.131.185.171
44	10.131.185.172/30	10.131.185.173 – 10.131.185.174	10.131.185.175
45	10.131.185.176/30	10.131.185.177 – 10.131.185.178	10.131.185.179
46	10.131.185.180/30	10.131.185.181 – 10.131.185.182	10.131.185.183
47	10.131.185.184/30	10.131.185.185 – 10.131.185.186	10.131.185.187
48	10.131.185.188/30	10.131.185.189 – 10.131.185.190	10.131.185.191
49	10.131.185.192/30	10.131.185.193 – 10.131.185.194	10.131.185.195
50	10.131.185.196/30	10.131.185.197 – 10.131.185.198	10.131.185.199
51	10.131.185.200/30	10.131.185.201 – 10.131.185.202	10.131.185.203
52	10.131.185.204/30	10.131.185.205 – 10.131.185.206	10.131.185.207
53	10.131.185.208/30	10.131.185.209 – 10.131.185.210	10.131.185.211
54	10.131.185.212/30	10.131.185.213 – 10.131.185.214	10.131.185.215
55	10.131.185.216/30	10.131.185.217 – 10.131.185.218	10.131.185.219
56	10.131.185.220/30	10.131.185.221 – 10.131.185.222	10.131.185.223
57	10.131.185.224/30	10.131.185.225 – 10.131.185.226	10.131.185.227
58	10.131.185.228/30	10.131.185.229 – 10.131.185.230	10.131.185.231
59	10.131.185.232/30	10.131.185.233 – 10.131.185.234	10.131.185.235
60	10.131.185.236/30	10.131.185.237 – 10.131.185.238	10.131.185.239
61	10.131.185.240/30	10.131.185.241 – 10.131.185.242	10.131.185.243
62	10.131.185.244/30	10.131.185.245 – 10.131.185.246	10.131.185.247
63	10.131.185.248/30	10.131.185.249 – 10.131.185.250	10.131.185.251
64	10.131.185.252/30	10.131.185.253 – 10.131.185.254	10.131.185.255

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 →