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)10.2.112.0/20

network10.2.112.0/20

broadcast10.2.127.255

first host10.2.112.1

last host10.2.127.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.2.112.0/20

address00001010.00000010.01110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000010.01110000.00000000

broadcast00001010.00000010.01111111.11111111

green = network part, grey = host part

hex0x0a027000

decimal167931904

reverse dns0.112.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7000

/20 split into /26 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.112.0/26	10.2.112.1 – 10.2.112.62	10.2.112.63
2	10.2.112.64/26	10.2.112.65 – 10.2.112.126	10.2.112.127
3	10.2.112.128/26	10.2.112.129 – 10.2.112.190	10.2.112.191
4	10.2.112.192/26	10.2.112.193 – 10.2.112.254	10.2.112.255
5	10.2.113.0/26	10.2.113.1 – 10.2.113.62	10.2.113.63
6	10.2.113.64/26	10.2.113.65 – 10.2.113.126	10.2.113.127
7	10.2.113.128/26	10.2.113.129 – 10.2.113.190	10.2.113.191
8	10.2.113.192/26	10.2.113.193 – 10.2.113.254	10.2.113.255
9	10.2.114.0/26	10.2.114.1 – 10.2.114.62	10.2.114.63
10	10.2.114.64/26	10.2.114.65 – 10.2.114.126	10.2.114.127
11	10.2.114.128/26	10.2.114.129 – 10.2.114.190	10.2.114.191
12	10.2.114.192/26	10.2.114.193 – 10.2.114.254	10.2.114.255
13	10.2.115.0/26	10.2.115.1 – 10.2.115.62	10.2.115.63
14	10.2.115.64/26	10.2.115.65 – 10.2.115.126	10.2.115.127
15	10.2.115.128/26	10.2.115.129 – 10.2.115.190	10.2.115.191
16	10.2.115.192/26	10.2.115.193 – 10.2.115.254	10.2.115.255
17	10.2.116.0/26	10.2.116.1 – 10.2.116.62	10.2.116.63
18	10.2.116.64/26	10.2.116.65 – 10.2.116.126	10.2.116.127
19	10.2.116.128/26	10.2.116.129 – 10.2.116.190	10.2.116.191
20	10.2.116.192/26	10.2.116.193 – 10.2.116.254	10.2.116.255
21	10.2.117.0/26	10.2.117.1 – 10.2.117.62	10.2.117.63
22	10.2.117.64/26	10.2.117.65 – 10.2.117.126	10.2.117.127
23	10.2.117.128/26	10.2.117.129 – 10.2.117.190	10.2.117.191
24	10.2.117.192/26	10.2.117.193 – 10.2.117.254	10.2.117.255
25	10.2.118.0/26	10.2.118.1 – 10.2.118.62	10.2.118.63
26	10.2.118.64/26	10.2.118.65 – 10.2.118.126	10.2.118.127
27	10.2.118.128/26	10.2.118.129 – 10.2.118.190	10.2.118.191
28	10.2.118.192/26	10.2.118.193 – 10.2.118.254	10.2.118.255
29	10.2.119.0/26	10.2.119.1 – 10.2.119.62	10.2.119.63
30	10.2.119.64/26	10.2.119.65 – 10.2.119.126	10.2.119.127
31	10.2.119.128/26	10.2.119.129 – 10.2.119.190	10.2.119.191
32	10.2.119.192/26	10.2.119.193 – 10.2.119.254	10.2.119.255
33	10.2.120.0/26	10.2.120.1 – 10.2.120.62	10.2.120.63
34	10.2.120.64/26	10.2.120.65 – 10.2.120.126	10.2.120.127
35	10.2.120.128/26	10.2.120.129 – 10.2.120.190	10.2.120.191
36	10.2.120.192/26	10.2.120.193 – 10.2.120.254	10.2.120.255
37	10.2.121.0/26	10.2.121.1 – 10.2.121.62	10.2.121.63
38	10.2.121.64/26	10.2.121.65 – 10.2.121.126	10.2.121.127
39	10.2.121.128/26	10.2.121.129 – 10.2.121.190	10.2.121.191
40	10.2.121.192/26	10.2.121.193 – 10.2.121.254	10.2.121.255
41	10.2.122.0/26	10.2.122.1 – 10.2.122.62	10.2.122.63
42	10.2.122.64/26	10.2.122.65 – 10.2.122.126	10.2.122.127
43	10.2.122.128/26	10.2.122.129 – 10.2.122.190	10.2.122.191
44	10.2.122.192/26	10.2.122.193 – 10.2.122.254	10.2.122.255
45	10.2.123.0/26	10.2.123.1 – 10.2.123.62	10.2.123.63
46	10.2.123.64/26	10.2.123.65 – 10.2.123.126	10.2.123.127
47	10.2.123.128/26	10.2.123.129 – 10.2.123.190	10.2.123.191
48	10.2.123.192/26	10.2.123.193 – 10.2.123.254	10.2.123.255
49	10.2.124.0/26	10.2.124.1 – 10.2.124.62	10.2.124.63
50	10.2.124.64/26	10.2.124.65 – 10.2.124.126	10.2.124.127
51	10.2.124.128/26	10.2.124.129 – 10.2.124.190	10.2.124.191
52	10.2.124.192/26	10.2.124.193 – 10.2.124.254	10.2.124.255
53	10.2.125.0/26	10.2.125.1 – 10.2.125.62	10.2.125.63
54	10.2.125.64/26	10.2.125.65 – 10.2.125.126	10.2.125.127
55	10.2.125.128/26	10.2.125.129 – 10.2.125.190	10.2.125.191
56	10.2.125.192/26	10.2.125.193 – 10.2.125.254	10.2.125.255
57	10.2.126.0/26	10.2.126.1 – 10.2.126.62	10.2.126.63
58	10.2.126.64/26	10.2.126.65 – 10.2.126.126	10.2.126.127
59	10.2.126.128/26	10.2.126.129 – 10.2.126.190	10.2.126.191
60	10.2.126.192/26	10.2.126.193 – 10.2.126.254	10.2.126.255
61	10.2.127.0/26	10.2.127.1 – 10.2.127.62	10.2.127.63
62	10.2.127.64/26	10.2.127.65 – 10.2.127.126	10.2.127.127
63	10.2.127.128/26	10.2.127.129 – 10.2.127.190	10.2.127.191
64	10.2.127.192/26	10.2.127.193 – 10.2.127.254	10.2.127.255

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 →