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)10.131.68.0/24

network10.131.68.0/24

broadcast10.131.68.255

first host10.131.68.1

last host10.131.68.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.131.68.0/24

address00001010.10000011.01000100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000011.01000100.00000000

broadcast00001010.10000011.01000100.11111111

green = network part, grey = host part

hex0x0a834400

decimal176374784

reverse dns0.68.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:4400

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.68.0/30	10.131.68.1 – 10.131.68.2	10.131.68.3
2	10.131.68.4/30	10.131.68.5 – 10.131.68.6	10.131.68.7
3	10.131.68.8/30	10.131.68.9 – 10.131.68.10	10.131.68.11
4	10.131.68.12/30	10.131.68.13 – 10.131.68.14	10.131.68.15
5	10.131.68.16/30	10.131.68.17 – 10.131.68.18	10.131.68.19
6	10.131.68.20/30	10.131.68.21 – 10.131.68.22	10.131.68.23
7	10.131.68.24/30	10.131.68.25 – 10.131.68.26	10.131.68.27
8	10.131.68.28/30	10.131.68.29 – 10.131.68.30	10.131.68.31
9	10.131.68.32/30	10.131.68.33 – 10.131.68.34	10.131.68.35
10	10.131.68.36/30	10.131.68.37 – 10.131.68.38	10.131.68.39
11	10.131.68.40/30	10.131.68.41 – 10.131.68.42	10.131.68.43
12	10.131.68.44/30	10.131.68.45 – 10.131.68.46	10.131.68.47
13	10.131.68.48/30	10.131.68.49 – 10.131.68.50	10.131.68.51
14	10.131.68.52/30	10.131.68.53 – 10.131.68.54	10.131.68.55
15	10.131.68.56/30	10.131.68.57 – 10.131.68.58	10.131.68.59
16	10.131.68.60/30	10.131.68.61 – 10.131.68.62	10.131.68.63
17	10.131.68.64/30	10.131.68.65 – 10.131.68.66	10.131.68.67
18	10.131.68.68/30	10.131.68.69 – 10.131.68.70	10.131.68.71
19	10.131.68.72/30	10.131.68.73 – 10.131.68.74	10.131.68.75
20	10.131.68.76/30	10.131.68.77 – 10.131.68.78	10.131.68.79
21	10.131.68.80/30	10.131.68.81 – 10.131.68.82	10.131.68.83
22	10.131.68.84/30	10.131.68.85 – 10.131.68.86	10.131.68.87
23	10.131.68.88/30	10.131.68.89 – 10.131.68.90	10.131.68.91
24	10.131.68.92/30	10.131.68.93 – 10.131.68.94	10.131.68.95
25	10.131.68.96/30	10.131.68.97 – 10.131.68.98	10.131.68.99
26	10.131.68.100/30	10.131.68.101 – 10.131.68.102	10.131.68.103
27	10.131.68.104/30	10.131.68.105 – 10.131.68.106	10.131.68.107
28	10.131.68.108/30	10.131.68.109 – 10.131.68.110	10.131.68.111
29	10.131.68.112/30	10.131.68.113 – 10.131.68.114	10.131.68.115
30	10.131.68.116/30	10.131.68.117 – 10.131.68.118	10.131.68.119
31	10.131.68.120/30	10.131.68.121 – 10.131.68.122	10.131.68.123
32	10.131.68.124/30	10.131.68.125 – 10.131.68.126	10.131.68.127
33	10.131.68.128/30	10.131.68.129 – 10.131.68.130	10.131.68.131
34	10.131.68.132/30	10.131.68.133 – 10.131.68.134	10.131.68.135
35	10.131.68.136/30	10.131.68.137 – 10.131.68.138	10.131.68.139
36	10.131.68.140/30	10.131.68.141 – 10.131.68.142	10.131.68.143
37	10.131.68.144/30	10.131.68.145 – 10.131.68.146	10.131.68.147
38	10.131.68.148/30	10.131.68.149 – 10.131.68.150	10.131.68.151
39	10.131.68.152/30	10.131.68.153 – 10.131.68.154	10.131.68.155
40	10.131.68.156/30	10.131.68.157 – 10.131.68.158	10.131.68.159
41	10.131.68.160/30	10.131.68.161 – 10.131.68.162	10.131.68.163
42	10.131.68.164/30	10.131.68.165 – 10.131.68.166	10.131.68.167
43	10.131.68.168/30	10.131.68.169 – 10.131.68.170	10.131.68.171
44	10.131.68.172/30	10.131.68.173 – 10.131.68.174	10.131.68.175
45	10.131.68.176/30	10.131.68.177 – 10.131.68.178	10.131.68.179
46	10.131.68.180/30	10.131.68.181 – 10.131.68.182	10.131.68.183
47	10.131.68.184/30	10.131.68.185 – 10.131.68.186	10.131.68.187
48	10.131.68.188/30	10.131.68.189 – 10.131.68.190	10.131.68.191
49	10.131.68.192/30	10.131.68.193 – 10.131.68.194	10.131.68.195
50	10.131.68.196/30	10.131.68.197 – 10.131.68.198	10.131.68.199
51	10.131.68.200/30	10.131.68.201 – 10.131.68.202	10.131.68.203
52	10.131.68.204/30	10.131.68.205 – 10.131.68.206	10.131.68.207
53	10.131.68.208/30	10.131.68.209 – 10.131.68.210	10.131.68.211
54	10.131.68.212/30	10.131.68.213 – 10.131.68.214	10.131.68.215
55	10.131.68.216/30	10.131.68.217 – 10.131.68.218	10.131.68.219
56	10.131.68.220/30	10.131.68.221 – 10.131.68.222	10.131.68.223
57	10.131.68.224/30	10.131.68.225 – 10.131.68.226	10.131.68.227
58	10.131.68.228/30	10.131.68.229 – 10.131.68.230	10.131.68.231
59	10.131.68.232/30	10.131.68.233 – 10.131.68.234	10.131.68.235
60	10.131.68.236/30	10.131.68.237 – 10.131.68.238	10.131.68.239
61	10.131.68.240/30	10.131.68.241 – 10.131.68.242	10.131.68.243
62	10.131.68.244/30	10.131.68.245 – 10.131.68.246	10.131.68.247
63	10.131.68.248/30	10.131.68.249 – 10.131.68.250	10.131.68.251
64	10.131.68.252/30	10.131.68.253 – 10.131.68.254	10.131.68.255

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 →