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)10.131.16.0/22

network10.131.16.0/22

broadcast10.131.19.255

first host10.131.16.1

last host10.131.19.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.131.16.0/22

address00001010.10000011.00010000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.10000011.00010000.00000000

broadcast00001010.10000011.00010011.11111111

green = network part, grey = host part

hex0x0a831000

decimal176361472

reverse dns0.16.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:1000

/22 split into /28 · 64 subnets

close ×

#	network	host range	broadcast
1	10.131.16.0/28	10.131.16.1 – 10.131.16.14	10.131.16.15
2	10.131.16.16/28	10.131.16.17 – 10.131.16.30	10.131.16.31
3	10.131.16.32/28	10.131.16.33 – 10.131.16.46	10.131.16.47
4	10.131.16.48/28	10.131.16.49 – 10.131.16.62	10.131.16.63
5	10.131.16.64/28	10.131.16.65 – 10.131.16.78	10.131.16.79
6	10.131.16.80/28	10.131.16.81 – 10.131.16.94	10.131.16.95
7	10.131.16.96/28	10.131.16.97 – 10.131.16.110	10.131.16.111
8	10.131.16.112/28	10.131.16.113 – 10.131.16.126	10.131.16.127
9	10.131.16.128/28	10.131.16.129 – 10.131.16.142	10.131.16.143
10	10.131.16.144/28	10.131.16.145 – 10.131.16.158	10.131.16.159
11	10.131.16.160/28	10.131.16.161 – 10.131.16.174	10.131.16.175
12	10.131.16.176/28	10.131.16.177 – 10.131.16.190	10.131.16.191
13	10.131.16.192/28	10.131.16.193 – 10.131.16.206	10.131.16.207
14	10.131.16.208/28	10.131.16.209 – 10.131.16.222	10.131.16.223
15	10.131.16.224/28	10.131.16.225 – 10.131.16.238	10.131.16.239
16	10.131.16.240/28	10.131.16.241 – 10.131.16.254	10.131.16.255
17	10.131.17.0/28	10.131.17.1 – 10.131.17.14	10.131.17.15
18	10.131.17.16/28	10.131.17.17 – 10.131.17.30	10.131.17.31
19	10.131.17.32/28	10.131.17.33 – 10.131.17.46	10.131.17.47
20	10.131.17.48/28	10.131.17.49 – 10.131.17.62	10.131.17.63
21	10.131.17.64/28	10.131.17.65 – 10.131.17.78	10.131.17.79
22	10.131.17.80/28	10.131.17.81 – 10.131.17.94	10.131.17.95
23	10.131.17.96/28	10.131.17.97 – 10.131.17.110	10.131.17.111
24	10.131.17.112/28	10.131.17.113 – 10.131.17.126	10.131.17.127
25	10.131.17.128/28	10.131.17.129 – 10.131.17.142	10.131.17.143
26	10.131.17.144/28	10.131.17.145 – 10.131.17.158	10.131.17.159
27	10.131.17.160/28	10.131.17.161 – 10.131.17.174	10.131.17.175
28	10.131.17.176/28	10.131.17.177 – 10.131.17.190	10.131.17.191
29	10.131.17.192/28	10.131.17.193 – 10.131.17.206	10.131.17.207
30	10.131.17.208/28	10.131.17.209 – 10.131.17.222	10.131.17.223
31	10.131.17.224/28	10.131.17.225 – 10.131.17.238	10.131.17.239
32	10.131.17.240/28	10.131.17.241 – 10.131.17.254	10.131.17.255
33	10.131.18.0/28	10.131.18.1 – 10.131.18.14	10.131.18.15
34	10.131.18.16/28	10.131.18.17 – 10.131.18.30	10.131.18.31
35	10.131.18.32/28	10.131.18.33 – 10.131.18.46	10.131.18.47
36	10.131.18.48/28	10.131.18.49 – 10.131.18.62	10.131.18.63
37	10.131.18.64/28	10.131.18.65 – 10.131.18.78	10.131.18.79
38	10.131.18.80/28	10.131.18.81 – 10.131.18.94	10.131.18.95
39	10.131.18.96/28	10.131.18.97 – 10.131.18.110	10.131.18.111
40	10.131.18.112/28	10.131.18.113 – 10.131.18.126	10.131.18.127
41	10.131.18.128/28	10.131.18.129 – 10.131.18.142	10.131.18.143
42	10.131.18.144/28	10.131.18.145 – 10.131.18.158	10.131.18.159
43	10.131.18.160/28	10.131.18.161 – 10.131.18.174	10.131.18.175
44	10.131.18.176/28	10.131.18.177 – 10.131.18.190	10.131.18.191
45	10.131.18.192/28	10.131.18.193 – 10.131.18.206	10.131.18.207
46	10.131.18.208/28	10.131.18.209 – 10.131.18.222	10.131.18.223
47	10.131.18.224/28	10.131.18.225 – 10.131.18.238	10.131.18.239
48	10.131.18.240/28	10.131.18.241 – 10.131.18.254	10.131.18.255
49	10.131.19.0/28	10.131.19.1 – 10.131.19.14	10.131.19.15
50	10.131.19.16/28	10.131.19.17 – 10.131.19.30	10.131.19.31
51	10.131.19.32/28	10.131.19.33 – 10.131.19.46	10.131.19.47
52	10.131.19.48/28	10.131.19.49 – 10.131.19.62	10.131.19.63
53	10.131.19.64/28	10.131.19.65 – 10.131.19.78	10.131.19.79
54	10.131.19.80/28	10.131.19.81 – 10.131.19.94	10.131.19.95
55	10.131.19.96/28	10.131.19.97 – 10.131.19.110	10.131.19.111
56	10.131.19.112/28	10.131.19.113 – 10.131.19.126	10.131.19.127
57	10.131.19.128/28	10.131.19.129 – 10.131.19.142	10.131.19.143
58	10.131.19.144/28	10.131.19.145 – 10.131.19.158	10.131.19.159
59	10.131.19.160/28	10.131.19.161 – 10.131.19.174	10.131.19.175
60	10.131.19.176/28	10.131.19.177 – 10.131.19.190	10.131.19.191
61	10.131.19.192/28	10.131.19.193 – 10.131.19.206	10.131.19.207
62	10.131.19.208/28	10.131.19.209 – 10.131.19.222	10.131.19.223
63	10.131.19.224/28	10.131.19.225 – 10.131.19.238	10.131.19.239
64	10.131.19.240/28	10.131.19.241 – 10.131.19.254	10.131.19.255

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 /22
/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	1
/23	255.255.254.0	512	510	2 split →
/24	255.255.255.0	256	254	4 split →
/25	255.255.255.128	128	126	8 split →
/26	255.255.255.192	64	62	16 split →
/27	255.255.255.224	32	30	32 split →
/28	255.255.255.240	16	14	64 split →
/29	255.255.255.248	8	6	128 split →
/30	255.255.255.252	4	2	256 split →
/31	255.255.255.254	2	2	512 split →
/32	255.255.255.255	1	1	1,024 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 →