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)10.65.131.0/24

network10.65.131.0/24

broadcast10.65.131.255

first host10.65.131.1

last host10.65.131.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.65.131.0/24

address00001010.01000001.10000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01000001.10000011.00000000

broadcast00001010.01000001.10000011.11111111

green = network part, grey = host part

hex0x0a418300

decimal172065536

reverse dns0.131.65.10.in-addr.arpa

ipv4-mapped::ffff:a41:8300

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.65.131.0/30	10.65.131.1 – 10.65.131.2	10.65.131.3
2	10.65.131.4/30	10.65.131.5 – 10.65.131.6	10.65.131.7
3	10.65.131.8/30	10.65.131.9 – 10.65.131.10	10.65.131.11
4	10.65.131.12/30	10.65.131.13 – 10.65.131.14	10.65.131.15
5	10.65.131.16/30	10.65.131.17 – 10.65.131.18	10.65.131.19
6	10.65.131.20/30	10.65.131.21 – 10.65.131.22	10.65.131.23
7	10.65.131.24/30	10.65.131.25 – 10.65.131.26	10.65.131.27
8	10.65.131.28/30	10.65.131.29 – 10.65.131.30	10.65.131.31
9	10.65.131.32/30	10.65.131.33 – 10.65.131.34	10.65.131.35
10	10.65.131.36/30	10.65.131.37 – 10.65.131.38	10.65.131.39
11	10.65.131.40/30	10.65.131.41 – 10.65.131.42	10.65.131.43
12	10.65.131.44/30	10.65.131.45 – 10.65.131.46	10.65.131.47
13	10.65.131.48/30	10.65.131.49 – 10.65.131.50	10.65.131.51
14	10.65.131.52/30	10.65.131.53 – 10.65.131.54	10.65.131.55
15	10.65.131.56/30	10.65.131.57 – 10.65.131.58	10.65.131.59
16	10.65.131.60/30	10.65.131.61 – 10.65.131.62	10.65.131.63
17	10.65.131.64/30	10.65.131.65 – 10.65.131.66	10.65.131.67
18	10.65.131.68/30	10.65.131.69 – 10.65.131.70	10.65.131.71
19	10.65.131.72/30	10.65.131.73 – 10.65.131.74	10.65.131.75
20	10.65.131.76/30	10.65.131.77 – 10.65.131.78	10.65.131.79
21	10.65.131.80/30	10.65.131.81 – 10.65.131.82	10.65.131.83
22	10.65.131.84/30	10.65.131.85 – 10.65.131.86	10.65.131.87
23	10.65.131.88/30	10.65.131.89 – 10.65.131.90	10.65.131.91
24	10.65.131.92/30	10.65.131.93 – 10.65.131.94	10.65.131.95
25	10.65.131.96/30	10.65.131.97 – 10.65.131.98	10.65.131.99
26	10.65.131.100/30	10.65.131.101 – 10.65.131.102	10.65.131.103
27	10.65.131.104/30	10.65.131.105 – 10.65.131.106	10.65.131.107
28	10.65.131.108/30	10.65.131.109 – 10.65.131.110	10.65.131.111
29	10.65.131.112/30	10.65.131.113 – 10.65.131.114	10.65.131.115
30	10.65.131.116/30	10.65.131.117 – 10.65.131.118	10.65.131.119
31	10.65.131.120/30	10.65.131.121 – 10.65.131.122	10.65.131.123
32	10.65.131.124/30	10.65.131.125 – 10.65.131.126	10.65.131.127
33	10.65.131.128/30	10.65.131.129 – 10.65.131.130	10.65.131.131
34	10.65.131.132/30	10.65.131.133 – 10.65.131.134	10.65.131.135
35	10.65.131.136/30	10.65.131.137 – 10.65.131.138	10.65.131.139
36	10.65.131.140/30	10.65.131.141 – 10.65.131.142	10.65.131.143
37	10.65.131.144/30	10.65.131.145 – 10.65.131.146	10.65.131.147
38	10.65.131.148/30	10.65.131.149 – 10.65.131.150	10.65.131.151
39	10.65.131.152/30	10.65.131.153 – 10.65.131.154	10.65.131.155
40	10.65.131.156/30	10.65.131.157 – 10.65.131.158	10.65.131.159
41	10.65.131.160/30	10.65.131.161 – 10.65.131.162	10.65.131.163
42	10.65.131.164/30	10.65.131.165 – 10.65.131.166	10.65.131.167
43	10.65.131.168/30	10.65.131.169 – 10.65.131.170	10.65.131.171
44	10.65.131.172/30	10.65.131.173 – 10.65.131.174	10.65.131.175
45	10.65.131.176/30	10.65.131.177 – 10.65.131.178	10.65.131.179
46	10.65.131.180/30	10.65.131.181 – 10.65.131.182	10.65.131.183
47	10.65.131.184/30	10.65.131.185 – 10.65.131.186	10.65.131.187
48	10.65.131.188/30	10.65.131.189 – 10.65.131.190	10.65.131.191
49	10.65.131.192/30	10.65.131.193 – 10.65.131.194	10.65.131.195
50	10.65.131.196/30	10.65.131.197 – 10.65.131.198	10.65.131.199
51	10.65.131.200/30	10.65.131.201 – 10.65.131.202	10.65.131.203
52	10.65.131.204/30	10.65.131.205 – 10.65.131.206	10.65.131.207
53	10.65.131.208/30	10.65.131.209 – 10.65.131.210	10.65.131.211
54	10.65.131.212/30	10.65.131.213 – 10.65.131.214	10.65.131.215
55	10.65.131.216/30	10.65.131.217 – 10.65.131.218	10.65.131.219
56	10.65.131.220/30	10.65.131.221 – 10.65.131.222	10.65.131.223
57	10.65.131.224/30	10.65.131.225 – 10.65.131.226	10.65.131.227
58	10.65.131.228/30	10.65.131.229 – 10.65.131.230	10.65.131.231
59	10.65.131.232/30	10.65.131.233 – 10.65.131.234	10.65.131.235
60	10.65.131.236/30	10.65.131.237 – 10.65.131.238	10.65.131.239
61	10.65.131.240/30	10.65.131.241 – 10.65.131.242	10.65.131.243
62	10.65.131.244/30	10.65.131.245 – 10.65.131.246	10.65.131.247
63	10.65.131.248/30	10.65.131.249 – 10.65.131.250	10.65.131.251
64	10.65.131.252/30	10.65.131.253 – 10.65.131.254	10.65.131.255

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 →