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)10.131.196.0/23

network10.131.196.0/23

broadcast10.131.197.255

first host10.131.196.1

last host10.131.197.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.131.196.0/23

address00001010.10000011.11000100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10000011.11000100.00000000

broadcast00001010.10000011.11000101.11111111

green = network part, grey = host part

hex0x0a83c400

decimal176407552

reverse dns0.196.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:c400

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.196.0/29	10.131.196.1 – 10.131.196.6	10.131.196.7
2	10.131.196.8/29	10.131.196.9 – 10.131.196.14	10.131.196.15
3	10.131.196.16/29	10.131.196.17 – 10.131.196.22	10.131.196.23
4	10.131.196.24/29	10.131.196.25 – 10.131.196.30	10.131.196.31
5	10.131.196.32/29	10.131.196.33 – 10.131.196.38	10.131.196.39
6	10.131.196.40/29	10.131.196.41 – 10.131.196.46	10.131.196.47
7	10.131.196.48/29	10.131.196.49 – 10.131.196.54	10.131.196.55
8	10.131.196.56/29	10.131.196.57 – 10.131.196.62	10.131.196.63
9	10.131.196.64/29	10.131.196.65 – 10.131.196.70	10.131.196.71
10	10.131.196.72/29	10.131.196.73 – 10.131.196.78	10.131.196.79
11	10.131.196.80/29	10.131.196.81 – 10.131.196.86	10.131.196.87
12	10.131.196.88/29	10.131.196.89 – 10.131.196.94	10.131.196.95
13	10.131.196.96/29	10.131.196.97 – 10.131.196.102	10.131.196.103
14	10.131.196.104/29	10.131.196.105 – 10.131.196.110	10.131.196.111
15	10.131.196.112/29	10.131.196.113 – 10.131.196.118	10.131.196.119
16	10.131.196.120/29	10.131.196.121 – 10.131.196.126	10.131.196.127
17	10.131.196.128/29	10.131.196.129 – 10.131.196.134	10.131.196.135
18	10.131.196.136/29	10.131.196.137 – 10.131.196.142	10.131.196.143
19	10.131.196.144/29	10.131.196.145 – 10.131.196.150	10.131.196.151
20	10.131.196.152/29	10.131.196.153 – 10.131.196.158	10.131.196.159
21	10.131.196.160/29	10.131.196.161 – 10.131.196.166	10.131.196.167
22	10.131.196.168/29	10.131.196.169 – 10.131.196.174	10.131.196.175
23	10.131.196.176/29	10.131.196.177 – 10.131.196.182	10.131.196.183
24	10.131.196.184/29	10.131.196.185 – 10.131.196.190	10.131.196.191
25	10.131.196.192/29	10.131.196.193 – 10.131.196.198	10.131.196.199
26	10.131.196.200/29	10.131.196.201 – 10.131.196.206	10.131.196.207
27	10.131.196.208/29	10.131.196.209 – 10.131.196.214	10.131.196.215
28	10.131.196.216/29	10.131.196.217 – 10.131.196.222	10.131.196.223
29	10.131.196.224/29	10.131.196.225 – 10.131.196.230	10.131.196.231
30	10.131.196.232/29	10.131.196.233 – 10.131.196.238	10.131.196.239
31	10.131.196.240/29	10.131.196.241 – 10.131.196.246	10.131.196.247
32	10.131.196.248/29	10.131.196.249 – 10.131.196.254	10.131.196.255
33	10.131.197.0/29	10.131.197.1 – 10.131.197.6	10.131.197.7
34	10.131.197.8/29	10.131.197.9 – 10.131.197.14	10.131.197.15
35	10.131.197.16/29	10.131.197.17 – 10.131.197.22	10.131.197.23
36	10.131.197.24/29	10.131.197.25 – 10.131.197.30	10.131.197.31
37	10.131.197.32/29	10.131.197.33 – 10.131.197.38	10.131.197.39
38	10.131.197.40/29	10.131.197.41 – 10.131.197.46	10.131.197.47
39	10.131.197.48/29	10.131.197.49 – 10.131.197.54	10.131.197.55
40	10.131.197.56/29	10.131.197.57 – 10.131.197.62	10.131.197.63
41	10.131.197.64/29	10.131.197.65 – 10.131.197.70	10.131.197.71
42	10.131.197.72/29	10.131.197.73 – 10.131.197.78	10.131.197.79
43	10.131.197.80/29	10.131.197.81 – 10.131.197.86	10.131.197.87
44	10.131.197.88/29	10.131.197.89 – 10.131.197.94	10.131.197.95
45	10.131.197.96/29	10.131.197.97 – 10.131.197.102	10.131.197.103
46	10.131.197.104/29	10.131.197.105 – 10.131.197.110	10.131.197.111
47	10.131.197.112/29	10.131.197.113 – 10.131.197.118	10.131.197.119
48	10.131.197.120/29	10.131.197.121 – 10.131.197.126	10.131.197.127
49	10.131.197.128/29	10.131.197.129 – 10.131.197.134	10.131.197.135
50	10.131.197.136/29	10.131.197.137 – 10.131.197.142	10.131.197.143
51	10.131.197.144/29	10.131.197.145 – 10.131.197.150	10.131.197.151
52	10.131.197.152/29	10.131.197.153 – 10.131.197.158	10.131.197.159
53	10.131.197.160/29	10.131.197.161 – 10.131.197.166	10.131.197.167
54	10.131.197.168/29	10.131.197.169 – 10.131.197.174	10.131.197.175
55	10.131.197.176/29	10.131.197.177 – 10.131.197.182	10.131.197.183
56	10.131.197.184/29	10.131.197.185 – 10.131.197.190	10.131.197.191
57	10.131.197.192/29	10.131.197.193 – 10.131.197.198	10.131.197.199
58	10.131.197.200/29	10.131.197.201 – 10.131.197.206	10.131.197.207
59	10.131.197.208/29	10.131.197.209 – 10.131.197.214	10.131.197.215
60	10.131.197.216/29	10.131.197.217 – 10.131.197.222	10.131.197.223
61	10.131.197.224/29	10.131.197.225 – 10.131.197.230	10.131.197.231
62	10.131.197.232/29	10.131.197.233 – 10.131.197.238	10.131.197.239
63	10.131.197.240/29	10.131.197.241 – 10.131.197.246	10.131.197.247
64	10.131.197.248/29	10.131.197.249 – 10.131.197.254	10.131.197.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →