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)10.167.0.0/20

network10.167.0.0/20

broadcast10.167.15.255

first host10.167.0.1

last host10.167.15.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.167.0.0/20

address00001010.10100111.00000000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.10100111.00000000.00000000

broadcast00001010.10100111.00001111.11111111

green = network part, grey = host part

hex0x0aa70000

decimal178716672

reverse dns0.0.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:0

/20 split into /26 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.0.0/26	10.167.0.1 – 10.167.0.62	10.167.0.63
2	10.167.0.64/26	10.167.0.65 – 10.167.0.126	10.167.0.127
3	10.167.0.128/26	10.167.0.129 – 10.167.0.190	10.167.0.191
4	10.167.0.192/26	10.167.0.193 – 10.167.0.254	10.167.0.255
5	10.167.1.0/26	10.167.1.1 – 10.167.1.62	10.167.1.63
6	10.167.1.64/26	10.167.1.65 – 10.167.1.126	10.167.1.127
7	10.167.1.128/26	10.167.1.129 – 10.167.1.190	10.167.1.191
8	10.167.1.192/26	10.167.1.193 – 10.167.1.254	10.167.1.255
9	10.167.2.0/26	10.167.2.1 – 10.167.2.62	10.167.2.63
10	10.167.2.64/26	10.167.2.65 – 10.167.2.126	10.167.2.127
11	10.167.2.128/26	10.167.2.129 – 10.167.2.190	10.167.2.191
12	10.167.2.192/26	10.167.2.193 – 10.167.2.254	10.167.2.255
13	10.167.3.0/26	10.167.3.1 – 10.167.3.62	10.167.3.63
14	10.167.3.64/26	10.167.3.65 – 10.167.3.126	10.167.3.127
15	10.167.3.128/26	10.167.3.129 – 10.167.3.190	10.167.3.191
16	10.167.3.192/26	10.167.3.193 – 10.167.3.254	10.167.3.255
17	10.167.4.0/26	10.167.4.1 – 10.167.4.62	10.167.4.63
18	10.167.4.64/26	10.167.4.65 – 10.167.4.126	10.167.4.127
19	10.167.4.128/26	10.167.4.129 – 10.167.4.190	10.167.4.191
20	10.167.4.192/26	10.167.4.193 – 10.167.4.254	10.167.4.255
21	10.167.5.0/26	10.167.5.1 – 10.167.5.62	10.167.5.63
22	10.167.5.64/26	10.167.5.65 – 10.167.5.126	10.167.5.127
23	10.167.5.128/26	10.167.5.129 – 10.167.5.190	10.167.5.191
24	10.167.5.192/26	10.167.5.193 – 10.167.5.254	10.167.5.255
25	10.167.6.0/26	10.167.6.1 – 10.167.6.62	10.167.6.63
26	10.167.6.64/26	10.167.6.65 – 10.167.6.126	10.167.6.127
27	10.167.6.128/26	10.167.6.129 – 10.167.6.190	10.167.6.191
28	10.167.6.192/26	10.167.6.193 – 10.167.6.254	10.167.6.255
29	10.167.7.0/26	10.167.7.1 – 10.167.7.62	10.167.7.63
30	10.167.7.64/26	10.167.7.65 – 10.167.7.126	10.167.7.127
31	10.167.7.128/26	10.167.7.129 – 10.167.7.190	10.167.7.191
32	10.167.7.192/26	10.167.7.193 – 10.167.7.254	10.167.7.255
33	10.167.8.0/26	10.167.8.1 – 10.167.8.62	10.167.8.63
34	10.167.8.64/26	10.167.8.65 – 10.167.8.126	10.167.8.127
35	10.167.8.128/26	10.167.8.129 – 10.167.8.190	10.167.8.191
36	10.167.8.192/26	10.167.8.193 – 10.167.8.254	10.167.8.255
37	10.167.9.0/26	10.167.9.1 – 10.167.9.62	10.167.9.63
38	10.167.9.64/26	10.167.9.65 – 10.167.9.126	10.167.9.127
39	10.167.9.128/26	10.167.9.129 – 10.167.9.190	10.167.9.191
40	10.167.9.192/26	10.167.9.193 – 10.167.9.254	10.167.9.255
41	10.167.10.0/26	10.167.10.1 – 10.167.10.62	10.167.10.63
42	10.167.10.64/26	10.167.10.65 – 10.167.10.126	10.167.10.127
43	10.167.10.128/26	10.167.10.129 – 10.167.10.190	10.167.10.191
44	10.167.10.192/26	10.167.10.193 – 10.167.10.254	10.167.10.255
45	10.167.11.0/26	10.167.11.1 – 10.167.11.62	10.167.11.63
46	10.167.11.64/26	10.167.11.65 – 10.167.11.126	10.167.11.127
47	10.167.11.128/26	10.167.11.129 – 10.167.11.190	10.167.11.191
48	10.167.11.192/26	10.167.11.193 – 10.167.11.254	10.167.11.255
49	10.167.12.0/26	10.167.12.1 – 10.167.12.62	10.167.12.63
50	10.167.12.64/26	10.167.12.65 – 10.167.12.126	10.167.12.127
51	10.167.12.128/26	10.167.12.129 – 10.167.12.190	10.167.12.191
52	10.167.12.192/26	10.167.12.193 – 10.167.12.254	10.167.12.255
53	10.167.13.0/26	10.167.13.1 – 10.167.13.62	10.167.13.63
54	10.167.13.64/26	10.167.13.65 – 10.167.13.126	10.167.13.127
55	10.167.13.128/26	10.167.13.129 – 10.167.13.190	10.167.13.191
56	10.167.13.192/26	10.167.13.193 – 10.167.13.254	10.167.13.255
57	10.167.14.0/26	10.167.14.1 – 10.167.14.62	10.167.14.63
58	10.167.14.64/26	10.167.14.65 – 10.167.14.126	10.167.14.127
59	10.167.14.128/26	10.167.14.129 – 10.167.14.190	10.167.14.191
60	10.167.14.192/26	10.167.14.193 – 10.167.14.254	10.167.14.255
61	10.167.15.0/26	10.167.15.1 – 10.167.15.62	10.167.15.63
62	10.167.15.64/26	10.167.15.65 – 10.167.15.126	10.167.15.127
63	10.167.15.128/26	10.167.15.129 – 10.167.15.190	10.167.15.191
64	10.167.15.192/26	10.167.15.193 – 10.167.15.254	10.167.15.255

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 /20
/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	1
/21	255.255.248.0	2,048	2,046	2 split →
/22	255.255.252.0	1,024	1,022	4 split →
/23	255.255.254.0	512	510	8 split →
/24	255.255.255.0	256	254	16 split →
/25	255.255.255.128	128	126	32 split →
/26	255.255.255.192	64	62	64 split →
/27	255.255.255.224	32	30	128 split →
/28	255.255.255.240	16	14	256 split →
/29	255.255.255.248	8	6	512 split →
/30	255.255.255.252	4	2	1,024 split →
/31	255.255.255.254	2	2	2,048 split →
/32	255.255.255.255	1	1	4,096 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 →