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)10.21.76.0/22

network10.21.76.0/22

broadcast10.21.79.255

first host10.21.76.1

last host10.21.79.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.21.76.0/22

address00001010.00010101.01001100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00010101.01001100.00000000

broadcast00001010.00010101.01001111.11111111

green = network part, grey = host part

hex0x0a154c00

decimal169167872

reverse dns0.76.21.10.in-addr.arpa

ipv4-mapped::ffff:a15:4c00

/22 split into /28 · 64 subnets

close ×

#	network	host range	broadcast
1	10.21.76.0/28	10.21.76.1 – 10.21.76.14	10.21.76.15
2	10.21.76.16/28	10.21.76.17 – 10.21.76.30	10.21.76.31
3	10.21.76.32/28	10.21.76.33 – 10.21.76.46	10.21.76.47
4	10.21.76.48/28	10.21.76.49 – 10.21.76.62	10.21.76.63
5	10.21.76.64/28	10.21.76.65 – 10.21.76.78	10.21.76.79
6	10.21.76.80/28	10.21.76.81 – 10.21.76.94	10.21.76.95
7	10.21.76.96/28	10.21.76.97 – 10.21.76.110	10.21.76.111
8	10.21.76.112/28	10.21.76.113 – 10.21.76.126	10.21.76.127
9	10.21.76.128/28	10.21.76.129 – 10.21.76.142	10.21.76.143
10	10.21.76.144/28	10.21.76.145 – 10.21.76.158	10.21.76.159
11	10.21.76.160/28	10.21.76.161 – 10.21.76.174	10.21.76.175
12	10.21.76.176/28	10.21.76.177 – 10.21.76.190	10.21.76.191
13	10.21.76.192/28	10.21.76.193 – 10.21.76.206	10.21.76.207
14	10.21.76.208/28	10.21.76.209 – 10.21.76.222	10.21.76.223
15	10.21.76.224/28	10.21.76.225 – 10.21.76.238	10.21.76.239
16	10.21.76.240/28	10.21.76.241 – 10.21.76.254	10.21.76.255
17	10.21.77.0/28	10.21.77.1 – 10.21.77.14	10.21.77.15
18	10.21.77.16/28	10.21.77.17 – 10.21.77.30	10.21.77.31
19	10.21.77.32/28	10.21.77.33 – 10.21.77.46	10.21.77.47
20	10.21.77.48/28	10.21.77.49 – 10.21.77.62	10.21.77.63
21	10.21.77.64/28	10.21.77.65 – 10.21.77.78	10.21.77.79
22	10.21.77.80/28	10.21.77.81 – 10.21.77.94	10.21.77.95
23	10.21.77.96/28	10.21.77.97 – 10.21.77.110	10.21.77.111
24	10.21.77.112/28	10.21.77.113 – 10.21.77.126	10.21.77.127
25	10.21.77.128/28	10.21.77.129 – 10.21.77.142	10.21.77.143
26	10.21.77.144/28	10.21.77.145 – 10.21.77.158	10.21.77.159
27	10.21.77.160/28	10.21.77.161 – 10.21.77.174	10.21.77.175
28	10.21.77.176/28	10.21.77.177 – 10.21.77.190	10.21.77.191
29	10.21.77.192/28	10.21.77.193 – 10.21.77.206	10.21.77.207
30	10.21.77.208/28	10.21.77.209 – 10.21.77.222	10.21.77.223
31	10.21.77.224/28	10.21.77.225 – 10.21.77.238	10.21.77.239
32	10.21.77.240/28	10.21.77.241 – 10.21.77.254	10.21.77.255
33	10.21.78.0/28	10.21.78.1 – 10.21.78.14	10.21.78.15
34	10.21.78.16/28	10.21.78.17 – 10.21.78.30	10.21.78.31
35	10.21.78.32/28	10.21.78.33 – 10.21.78.46	10.21.78.47
36	10.21.78.48/28	10.21.78.49 – 10.21.78.62	10.21.78.63
37	10.21.78.64/28	10.21.78.65 – 10.21.78.78	10.21.78.79
38	10.21.78.80/28	10.21.78.81 – 10.21.78.94	10.21.78.95
39	10.21.78.96/28	10.21.78.97 – 10.21.78.110	10.21.78.111
40	10.21.78.112/28	10.21.78.113 – 10.21.78.126	10.21.78.127
41	10.21.78.128/28	10.21.78.129 – 10.21.78.142	10.21.78.143
42	10.21.78.144/28	10.21.78.145 – 10.21.78.158	10.21.78.159
43	10.21.78.160/28	10.21.78.161 – 10.21.78.174	10.21.78.175
44	10.21.78.176/28	10.21.78.177 – 10.21.78.190	10.21.78.191
45	10.21.78.192/28	10.21.78.193 – 10.21.78.206	10.21.78.207
46	10.21.78.208/28	10.21.78.209 – 10.21.78.222	10.21.78.223
47	10.21.78.224/28	10.21.78.225 – 10.21.78.238	10.21.78.239
48	10.21.78.240/28	10.21.78.241 – 10.21.78.254	10.21.78.255
49	10.21.79.0/28	10.21.79.1 – 10.21.79.14	10.21.79.15
50	10.21.79.16/28	10.21.79.17 – 10.21.79.30	10.21.79.31
51	10.21.79.32/28	10.21.79.33 – 10.21.79.46	10.21.79.47
52	10.21.79.48/28	10.21.79.49 – 10.21.79.62	10.21.79.63
53	10.21.79.64/28	10.21.79.65 – 10.21.79.78	10.21.79.79
54	10.21.79.80/28	10.21.79.81 – 10.21.79.94	10.21.79.95
55	10.21.79.96/28	10.21.79.97 – 10.21.79.110	10.21.79.111
56	10.21.79.112/28	10.21.79.113 – 10.21.79.126	10.21.79.127
57	10.21.79.128/28	10.21.79.129 – 10.21.79.142	10.21.79.143
58	10.21.79.144/28	10.21.79.145 – 10.21.79.158	10.21.79.159
59	10.21.79.160/28	10.21.79.161 – 10.21.79.174	10.21.79.175
60	10.21.79.176/28	10.21.79.177 – 10.21.79.190	10.21.79.191
61	10.21.79.192/28	10.21.79.193 – 10.21.79.206	10.21.79.207
62	10.21.79.208/28	10.21.79.209 – 10.21.79.222	10.21.79.223
63	10.21.79.224/28	10.21.79.225 – 10.21.79.238	10.21.79.239
64	10.21.79.240/28	10.21.79.241 – 10.21.79.254	10.21.79.255

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