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)10.31.8.0/22

network10.31.8.0/22

broadcast10.31.11.255

first host10.31.8.1

last host10.31.11.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.31.8.0/22

address00001010.00011111.00001000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00011111.00001000.00000000

broadcast00001010.00011111.00001011.11111111

green = network part, grey = host part

hex0x0a1f0800

decimal169805824

reverse dns0.8.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:800

/22 split into /28 · 64 subnets

close ×

#	network	host range	broadcast
1	10.31.8.0/28	10.31.8.1 – 10.31.8.14	10.31.8.15
2	10.31.8.16/28	10.31.8.17 – 10.31.8.30	10.31.8.31
3	10.31.8.32/28	10.31.8.33 – 10.31.8.46	10.31.8.47
4	10.31.8.48/28	10.31.8.49 – 10.31.8.62	10.31.8.63
5	10.31.8.64/28	10.31.8.65 – 10.31.8.78	10.31.8.79
6	10.31.8.80/28	10.31.8.81 – 10.31.8.94	10.31.8.95
7	10.31.8.96/28	10.31.8.97 – 10.31.8.110	10.31.8.111
8	10.31.8.112/28	10.31.8.113 – 10.31.8.126	10.31.8.127
9	10.31.8.128/28	10.31.8.129 – 10.31.8.142	10.31.8.143
10	10.31.8.144/28	10.31.8.145 – 10.31.8.158	10.31.8.159
11	10.31.8.160/28	10.31.8.161 – 10.31.8.174	10.31.8.175
12	10.31.8.176/28	10.31.8.177 – 10.31.8.190	10.31.8.191
13	10.31.8.192/28	10.31.8.193 – 10.31.8.206	10.31.8.207
14	10.31.8.208/28	10.31.8.209 – 10.31.8.222	10.31.8.223
15	10.31.8.224/28	10.31.8.225 – 10.31.8.238	10.31.8.239
16	10.31.8.240/28	10.31.8.241 – 10.31.8.254	10.31.8.255
17	10.31.9.0/28	10.31.9.1 – 10.31.9.14	10.31.9.15
18	10.31.9.16/28	10.31.9.17 – 10.31.9.30	10.31.9.31
19	10.31.9.32/28	10.31.9.33 – 10.31.9.46	10.31.9.47
20	10.31.9.48/28	10.31.9.49 – 10.31.9.62	10.31.9.63
21	10.31.9.64/28	10.31.9.65 – 10.31.9.78	10.31.9.79
22	10.31.9.80/28	10.31.9.81 – 10.31.9.94	10.31.9.95
23	10.31.9.96/28	10.31.9.97 – 10.31.9.110	10.31.9.111
24	10.31.9.112/28	10.31.9.113 – 10.31.9.126	10.31.9.127
25	10.31.9.128/28	10.31.9.129 – 10.31.9.142	10.31.9.143
26	10.31.9.144/28	10.31.9.145 – 10.31.9.158	10.31.9.159
27	10.31.9.160/28	10.31.9.161 – 10.31.9.174	10.31.9.175
28	10.31.9.176/28	10.31.9.177 – 10.31.9.190	10.31.9.191
29	10.31.9.192/28	10.31.9.193 – 10.31.9.206	10.31.9.207
30	10.31.9.208/28	10.31.9.209 – 10.31.9.222	10.31.9.223
31	10.31.9.224/28	10.31.9.225 – 10.31.9.238	10.31.9.239
32	10.31.9.240/28	10.31.9.241 – 10.31.9.254	10.31.9.255
33	10.31.10.0/28	10.31.10.1 – 10.31.10.14	10.31.10.15
34	10.31.10.16/28	10.31.10.17 – 10.31.10.30	10.31.10.31
35	10.31.10.32/28	10.31.10.33 – 10.31.10.46	10.31.10.47
36	10.31.10.48/28	10.31.10.49 – 10.31.10.62	10.31.10.63
37	10.31.10.64/28	10.31.10.65 – 10.31.10.78	10.31.10.79
38	10.31.10.80/28	10.31.10.81 – 10.31.10.94	10.31.10.95
39	10.31.10.96/28	10.31.10.97 – 10.31.10.110	10.31.10.111
40	10.31.10.112/28	10.31.10.113 – 10.31.10.126	10.31.10.127
41	10.31.10.128/28	10.31.10.129 – 10.31.10.142	10.31.10.143
42	10.31.10.144/28	10.31.10.145 – 10.31.10.158	10.31.10.159
43	10.31.10.160/28	10.31.10.161 – 10.31.10.174	10.31.10.175
44	10.31.10.176/28	10.31.10.177 – 10.31.10.190	10.31.10.191
45	10.31.10.192/28	10.31.10.193 – 10.31.10.206	10.31.10.207
46	10.31.10.208/28	10.31.10.209 – 10.31.10.222	10.31.10.223
47	10.31.10.224/28	10.31.10.225 – 10.31.10.238	10.31.10.239
48	10.31.10.240/28	10.31.10.241 – 10.31.10.254	10.31.10.255
49	10.31.11.0/28	10.31.11.1 – 10.31.11.14	10.31.11.15
50	10.31.11.16/28	10.31.11.17 – 10.31.11.30	10.31.11.31
51	10.31.11.32/28	10.31.11.33 – 10.31.11.46	10.31.11.47
52	10.31.11.48/28	10.31.11.49 – 10.31.11.62	10.31.11.63
53	10.31.11.64/28	10.31.11.65 – 10.31.11.78	10.31.11.79
54	10.31.11.80/28	10.31.11.81 – 10.31.11.94	10.31.11.95
55	10.31.11.96/28	10.31.11.97 – 10.31.11.110	10.31.11.111
56	10.31.11.112/28	10.31.11.113 – 10.31.11.126	10.31.11.127
57	10.31.11.128/28	10.31.11.129 – 10.31.11.142	10.31.11.143
58	10.31.11.144/28	10.31.11.145 – 10.31.11.158	10.31.11.159
59	10.31.11.160/28	10.31.11.161 – 10.31.11.174	10.31.11.175
60	10.31.11.176/28	10.31.11.177 – 10.31.11.190	10.31.11.191
61	10.31.11.192/28	10.31.11.193 – 10.31.11.206	10.31.11.207
62	10.31.11.208/28	10.31.11.209 – 10.31.11.222	10.31.11.223
63	10.31.11.224/28	10.31.11.225 – 10.31.11.238	10.31.11.239
64	10.31.11.240/28	10.31.11.241 – 10.31.11.254	10.31.11.255

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 →