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)10.2.58.0/26

network10.2.58.0/26

broadcast10.2.58.63

first host10.2.58.1

last host10.2.58.62

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.58.0/26

address00001010.00000010.00111010.00000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.00111010.00000000

broadcast00001010.00000010.00111010.00111111

green = network part, grey = host part

hex0x0a023a00

decimal167918080

reverse dns0.58.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3a00

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	10.2.58.0/31	10.2.58.0 – 10.2.58.1	10.2.58.1
2	10.2.58.2/31	10.2.58.2 – 10.2.58.3	10.2.58.3
3	10.2.58.4/31	10.2.58.4 – 10.2.58.5	10.2.58.5
4	10.2.58.6/31	10.2.58.6 – 10.2.58.7	10.2.58.7
5	10.2.58.8/31	10.2.58.8 – 10.2.58.9	10.2.58.9
6	10.2.58.10/31	10.2.58.10 – 10.2.58.11	10.2.58.11
7	10.2.58.12/31	10.2.58.12 – 10.2.58.13	10.2.58.13
8	10.2.58.14/31	10.2.58.14 – 10.2.58.15	10.2.58.15
9	10.2.58.16/31	10.2.58.16 – 10.2.58.17	10.2.58.17
10	10.2.58.18/31	10.2.58.18 – 10.2.58.19	10.2.58.19
11	10.2.58.20/31	10.2.58.20 – 10.2.58.21	10.2.58.21
12	10.2.58.22/31	10.2.58.22 – 10.2.58.23	10.2.58.23
13	10.2.58.24/31	10.2.58.24 – 10.2.58.25	10.2.58.25
14	10.2.58.26/31	10.2.58.26 – 10.2.58.27	10.2.58.27
15	10.2.58.28/31	10.2.58.28 – 10.2.58.29	10.2.58.29
16	10.2.58.30/31	10.2.58.30 – 10.2.58.31	10.2.58.31
17	10.2.58.32/31	10.2.58.32 – 10.2.58.33	10.2.58.33
18	10.2.58.34/31	10.2.58.34 – 10.2.58.35	10.2.58.35
19	10.2.58.36/31	10.2.58.36 – 10.2.58.37	10.2.58.37
20	10.2.58.38/31	10.2.58.38 – 10.2.58.39	10.2.58.39
21	10.2.58.40/31	10.2.58.40 – 10.2.58.41	10.2.58.41
22	10.2.58.42/31	10.2.58.42 – 10.2.58.43	10.2.58.43
23	10.2.58.44/31	10.2.58.44 – 10.2.58.45	10.2.58.45
24	10.2.58.46/31	10.2.58.46 – 10.2.58.47	10.2.58.47
25	10.2.58.48/31	10.2.58.48 – 10.2.58.49	10.2.58.49
26	10.2.58.50/31	10.2.58.50 – 10.2.58.51	10.2.58.51
27	10.2.58.52/31	10.2.58.52 – 10.2.58.53	10.2.58.53
28	10.2.58.54/31	10.2.58.54 – 10.2.58.55	10.2.58.55
29	10.2.58.56/31	10.2.58.56 – 10.2.58.57	10.2.58.57
30	10.2.58.58/31	10.2.58.58 – 10.2.58.59	10.2.58.59
31	10.2.58.60/31	10.2.58.60 – 10.2.58.61	10.2.58.61
32	10.2.58.62/31	10.2.58.62 – 10.2.58.63	10.2.58.63

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