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)10.2.63.32/27

network10.2.63.32/27

broadcast10.2.63.63

first host10.2.63.33

last host10.2.63.62

subnet mask255.255.255.224

wildcard0.0.0.31

addresses32

usable hosts30

classA

ipcalc 10.2.63.32/27

address00001010.00000010.00111111.00100000

subnet mask11111111.11111111.11111111.11100000

network00001010.00000010.00111111.00100000

broadcast00001010.00000010.00111111.00111111

green = network part, grey = host part

hex0x0a023f20

decimal167919392

reverse dns32.63.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3f20

/27 split into /32 · 32 subnets

close ×

#	network	host range	broadcast
1	10.2.63.32/32	10.2.63.32 – 10.2.63.32	10.2.63.32
2	10.2.63.33/32	10.2.63.33 – 10.2.63.33	10.2.63.33
3	10.2.63.34/32	10.2.63.34 – 10.2.63.34	10.2.63.34
4	10.2.63.35/32	10.2.63.35 – 10.2.63.35	10.2.63.35
5	10.2.63.36/32	10.2.63.36 – 10.2.63.36	10.2.63.36
6	10.2.63.37/32	10.2.63.37 – 10.2.63.37	10.2.63.37
7	10.2.63.38/32	10.2.63.38 – 10.2.63.38	10.2.63.38
8	10.2.63.39/32	10.2.63.39 – 10.2.63.39	10.2.63.39
9	10.2.63.40/32	10.2.63.40 – 10.2.63.40	10.2.63.40
10	10.2.63.41/32	10.2.63.41 – 10.2.63.41	10.2.63.41
11	10.2.63.42/32	10.2.63.42 – 10.2.63.42	10.2.63.42
12	10.2.63.43/32	10.2.63.43 – 10.2.63.43	10.2.63.43
13	10.2.63.44/32	10.2.63.44 – 10.2.63.44	10.2.63.44
14	10.2.63.45/32	10.2.63.45 – 10.2.63.45	10.2.63.45
15	10.2.63.46/32	10.2.63.46 – 10.2.63.46	10.2.63.46
16	10.2.63.47/32	10.2.63.47 – 10.2.63.47	10.2.63.47
17	10.2.63.48/32	10.2.63.48 – 10.2.63.48	10.2.63.48
18	10.2.63.49/32	10.2.63.49 – 10.2.63.49	10.2.63.49
19	10.2.63.50/32	10.2.63.50 – 10.2.63.50	10.2.63.50
20	10.2.63.51/32	10.2.63.51 – 10.2.63.51	10.2.63.51
21	10.2.63.52/32	10.2.63.52 – 10.2.63.52	10.2.63.52
22	10.2.63.53/32	10.2.63.53 – 10.2.63.53	10.2.63.53
23	10.2.63.54/32	10.2.63.54 – 10.2.63.54	10.2.63.54
24	10.2.63.55/32	10.2.63.55 – 10.2.63.55	10.2.63.55
25	10.2.63.56/32	10.2.63.56 – 10.2.63.56	10.2.63.56
26	10.2.63.57/32	10.2.63.57 – 10.2.63.57	10.2.63.57
27	10.2.63.58/32	10.2.63.58 – 10.2.63.58	10.2.63.58
28	10.2.63.59/32	10.2.63.59 – 10.2.63.59	10.2.63.59
29	10.2.63.60/32	10.2.63.60 – 10.2.63.60	10.2.63.60
30	10.2.63.61/32	10.2.63.61 – 10.2.63.61	10.2.63.61
31	10.2.63.62/32	10.2.63.62 – 10.2.63.62	10.2.63.62
32	10.2.63.63/32	10.2.63.63 – 10.2.63.63	10.2.63.63

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 /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 →