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)10.2.40.0/22

network10.2.40.0/22

broadcast10.2.43.255

first host10.2.40.1

last host10.2.43.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.2.40.0/22

address00001010.00000010.00101000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000010.00101000.00000000

broadcast00001010.00000010.00101011.11111111

green = network part, grey = host part

hex0x0a022800

decimal167913472

reverse dns0.40.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:2800

/22 split into /27 · 32 subnets

close ×

#	network	host range	broadcast
1	10.2.40.0/27	10.2.40.1 – 10.2.40.30	10.2.40.31
2	10.2.40.32/27	10.2.40.33 – 10.2.40.62	10.2.40.63
3	10.2.40.64/27	10.2.40.65 – 10.2.40.94	10.2.40.95
4	10.2.40.96/27	10.2.40.97 – 10.2.40.126	10.2.40.127
5	10.2.40.128/27	10.2.40.129 – 10.2.40.158	10.2.40.159
6	10.2.40.160/27	10.2.40.161 – 10.2.40.190	10.2.40.191
7	10.2.40.192/27	10.2.40.193 – 10.2.40.222	10.2.40.223
8	10.2.40.224/27	10.2.40.225 – 10.2.40.254	10.2.40.255
9	10.2.41.0/27	10.2.41.1 – 10.2.41.30	10.2.41.31
10	10.2.41.32/27	10.2.41.33 – 10.2.41.62	10.2.41.63
11	10.2.41.64/27	10.2.41.65 – 10.2.41.94	10.2.41.95
12	10.2.41.96/27	10.2.41.97 – 10.2.41.126	10.2.41.127
13	10.2.41.128/27	10.2.41.129 – 10.2.41.158	10.2.41.159
14	10.2.41.160/27	10.2.41.161 – 10.2.41.190	10.2.41.191
15	10.2.41.192/27	10.2.41.193 – 10.2.41.222	10.2.41.223
16	10.2.41.224/27	10.2.41.225 – 10.2.41.254	10.2.41.255
17	10.2.42.0/27	10.2.42.1 – 10.2.42.30	10.2.42.31
18	10.2.42.32/27	10.2.42.33 – 10.2.42.62	10.2.42.63
19	10.2.42.64/27	10.2.42.65 – 10.2.42.94	10.2.42.95
20	10.2.42.96/27	10.2.42.97 – 10.2.42.126	10.2.42.127
21	10.2.42.128/27	10.2.42.129 – 10.2.42.158	10.2.42.159
22	10.2.42.160/27	10.2.42.161 – 10.2.42.190	10.2.42.191
23	10.2.42.192/27	10.2.42.193 – 10.2.42.222	10.2.42.223
24	10.2.42.224/27	10.2.42.225 – 10.2.42.254	10.2.42.255
25	10.2.43.0/27	10.2.43.1 – 10.2.43.30	10.2.43.31
26	10.2.43.32/27	10.2.43.33 – 10.2.43.62	10.2.43.63
27	10.2.43.64/27	10.2.43.65 – 10.2.43.94	10.2.43.95
28	10.2.43.96/27	10.2.43.97 – 10.2.43.126	10.2.43.127
29	10.2.43.128/27	10.2.43.129 – 10.2.43.158	10.2.43.159
30	10.2.43.160/27	10.2.43.161 – 10.2.43.190	10.2.43.191
31	10.2.43.192/27	10.2.43.193 – 10.2.43.222	10.2.43.223
32	10.2.43.224/27	10.2.43.225 – 10.2.43.254	10.2.43.255

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 →