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)10.76.4.0/27

network10.76.4.0/27

broadcast10.76.4.31

first host10.76.4.1

last host10.76.4.30

subnet mask255.255.255.224

wildcard0.0.0.31

addresses32

usable hosts30

classA

ipcalc 10.76.4.0/27

address00001010.01001100.00000100.00000000

subnet mask11111111.11111111.11111111.11100000

network00001010.01001100.00000100.00000000

broadcast00001010.01001100.00000100.00011111

green = network part, grey = host part

hex0x0a4c0400

decimal172753920

reverse dns0.4.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:400

/27 split into /32 · 32 subnets

close ×

#	network	host range	broadcast
1	10.76.4.0/32	10.76.4.0 – 10.76.4.0	10.76.4.0
2	10.76.4.1/32	10.76.4.1 – 10.76.4.1	10.76.4.1
3	10.76.4.2/32	10.76.4.2 – 10.76.4.2	10.76.4.2
4	10.76.4.3/32	10.76.4.3 – 10.76.4.3	10.76.4.3
5	10.76.4.4/32	10.76.4.4 – 10.76.4.4	10.76.4.4
6	10.76.4.5/32	10.76.4.5 – 10.76.4.5	10.76.4.5
7	10.76.4.6/32	10.76.4.6 – 10.76.4.6	10.76.4.6
8	10.76.4.7/32	10.76.4.7 – 10.76.4.7	10.76.4.7
9	10.76.4.8/32	10.76.4.8 – 10.76.4.8	10.76.4.8
10	10.76.4.9/32	10.76.4.9 – 10.76.4.9	10.76.4.9
11	10.76.4.10/32	10.76.4.10 – 10.76.4.10	10.76.4.10
12	10.76.4.11/32	10.76.4.11 – 10.76.4.11	10.76.4.11
13	10.76.4.12/32	10.76.4.12 – 10.76.4.12	10.76.4.12
14	10.76.4.13/32	10.76.4.13 – 10.76.4.13	10.76.4.13
15	10.76.4.14/32	10.76.4.14 – 10.76.4.14	10.76.4.14
16	10.76.4.15/32	10.76.4.15 – 10.76.4.15	10.76.4.15
17	10.76.4.16/32	10.76.4.16 – 10.76.4.16	10.76.4.16
18	10.76.4.17/32	10.76.4.17 – 10.76.4.17	10.76.4.17
19	10.76.4.18/32	10.76.4.18 – 10.76.4.18	10.76.4.18
20	10.76.4.19/32	10.76.4.19 – 10.76.4.19	10.76.4.19
21	10.76.4.20/32	10.76.4.20 – 10.76.4.20	10.76.4.20
22	10.76.4.21/32	10.76.4.21 – 10.76.4.21	10.76.4.21
23	10.76.4.22/32	10.76.4.22 – 10.76.4.22	10.76.4.22
24	10.76.4.23/32	10.76.4.23 – 10.76.4.23	10.76.4.23
25	10.76.4.24/32	10.76.4.24 – 10.76.4.24	10.76.4.24
26	10.76.4.25/32	10.76.4.25 – 10.76.4.25	10.76.4.25
27	10.76.4.26/32	10.76.4.26 – 10.76.4.26	10.76.4.26
28	10.76.4.27/32	10.76.4.27 – 10.76.4.27	10.76.4.27
29	10.76.4.28/32	10.76.4.28 – 10.76.4.28	10.76.4.28
30	10.76.4.29/32	10.76.4.29 – 10.76.4.29	10.76.4.29
31	10.76.4.30/32	10.76.4.30 – 10.76.4.30	10.76.4.30
32	10.76.4.31/32	10.76.4.31 – 10.76.4.31	10.76.4.31

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 /27
/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	-
/27	255.255.255.224	32	30	1
/28	255.255.255.240	16	14	2 split →
/29	255.255.255.248	8	6	4 split →
/30	255.255.255.252	4	2	8 split →
/31	255.255.255.254	2	2	16 split →
/32	255.255.255.255	1	1	32 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 →