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)10.2.164.0/22

network10.2.164.0/22

broadcast10.2.167.255

first host10.2.164.1

last host10.2.167.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.2.164.0/22

address00001010.00000010.10100100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000010.10100100.00000000

broadcast00001010.00000010.10100111.11111111

green = network part, grey = host part

hex0x0a02a400

decimal167945216

reverse dns0.164.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:a400

/22 split into /28 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.164.0/28	10.2.164.1 – 10.2.164.14	10.2.164.15
2	10.2.164.16/28	10.2.164.17 – 10.2.164.30	10.2.164.31
3	10.2.164.32/28	10.2.164.33 – 10.2.164.46	10.2.164.47
4	10.2.164.48/28	10.2.164.49 – 10.2.164.62	10.2.164.63
5	10.2.164.64/28	10.2.164.65 – 10.2.164.78	10.2.164.79
6	10.2.164.80/28	10.2.164.81 – 10.2.164.94	10.2.164.95
7	10.2.164.96/28	10.2.164.97 – 10.2.164.110	10.2.164.111
8	10.2.164.112/28	10.2.164.113 – 10.2.164.126	10.2.164.127
9	10.2.164.128/28	10.2.164.129 – 10.2.164.142	10.2.164.143
10	10.2.164.144/28	10.2.164.145 – 10.2.164.158	10.2.164.159
11	10.2.164.160/28	10.2.164.161 – 10.2.164.174	10.2.164.175
12	10.2.164.176/28	10.2.164.177 – 10.2.164.190	10.2.164.191
13	10.2.164.192/28	10.2.164.193 – 10.2.164.206	10.2.164.207
14	10.2.164.208/28	10.2.164.209 – 10.2.164.222	10.2.164.223
15	10.2.164.224/28	10.2.164.225 – 10.2.164.238	10.2.164.239
16	10.2.164.240/28	10.2.164.241 – 10.2.164.254	10.2.164.255
17	10.2.165.0/28	10.2.165.1 – 10.2.165.14	10.2.165.15
18	10.2.165.16/28	10.2.165.17 – 10.2.165.30	10.2.165.31
19	10.2.165.32/28	10.2.165.33 – 10.2.165.46	10.2.165.47
20	10.2.165.48/28	10.2.165.49 – 10.2.165.62	10.2.165.63
21	10.2.165.64/28	10.2.165.65 – 10.2.165.78	10.2.165.79
22	10.2.165.80/28	10.2.165.81 – 10.2.165.94	10.2.165.95
23	10.2.165.96/28	10.2.165.97 – 10.2.165.110	10.2.165.111
24	10.2.165.112/28	10.2.165.113 – 10.2.165.126	10.2.165.127
25	10.2.165.128/28	10.2.165.129 – 10.2.165.142	10.2.165.143
26	10.2.165.144/28	10.2.165.145 – 10.2.165.158	10.2.165.159
27	10.2.165.160/28	10.2.165.161 – 10.2.165.174	10.2.165.175
28	10.2.165.176/28	10.2.165.177 – 10.2.165.190	10.2.165.191
29	10.2.165.192/28	10.2.165.193 – 10.2.165.206	10.2.165.207
30	10.2.165.208/28	10.2.165.209 – 10.2.165.222	10.2.165.223
31	10.2.165.224/28	10.2.165.225 – 10.2.165.238	10.2.165.239
32	10.2.165.240/28	10.2.165.241 – 10.2.165.254	10.2.165.255
33	10.2.166.0/28	10.2.166.1 – 10.2.166.14	10.2.166.15
34	10.2.166.16/28	10.2.166.17 – 10.2.166.30	10.2.166.31
35	10.2.166.32/28	10.2.166.33 – 10.2.166.46	10.2.166.47
36	10.2.166.48/28	10.2.166.49 – 10.2.166.62	10.2.166.63
37	10.2.166.64/28	10.2.166.65 – 10.2.166.78	10.2.166.79
38	10.2.166.80/28	10.2.166.81 – 10.2.166.94	10.2.166.95
39	10.2.166.96/28	10.2.166.97 – 10.2.166.110	10.2.166.111
40	10.2.166.112/28	10.2.166.113 – 10.2.166.126	10.2.166.127
41	10.2.166.128/28	10.2.166.129 – 10.2.166.142	10.2.166.143
42	10.2.166.144/28	10.2.166.145 – 10.2.166.158	10.2.166.159
43	10.2.166.160/28	10.2.166.161 – 10.2.166.174	10.2.166.175
44	10.2.166.176/28	10.2.166.177 – 10.2.166.190	10.2.166.191
45	10.2.166.192/28	10.2.166.193 – 10.2.166.206	10.2.166.207
46	10.2.166.208/28	10.2.166.209 – 10.2.166.222	10.2.166.223
47	10.2.166.224/28	10.2.166.225 – 10.2.166.238	10.2.166.239
48	10.2.166.240/28	10.2.166.241 – 10.2.166.254	10.2.166.255
49	10.2.167.0/28	10.2.167.1 – 10.2.167.14	10.2.167.15
50	10.2.167.16/28	10.2.167.17 – 10.2.167.30	10.2.167.31
51	10.2.167.32/28	10.2.167.33 – 10.2.167.46	10.2.167.47
52	10.2.167.48/28	10.2.167.49 – 10.2.167.62	10.2.167.63
53	10.2.167.64/28	10.2.167.65 – 10.2.167.78	10.2.167.79
54	10.2.167.80/28	10.2.167.81 – 10.2.167.94	10.2.167.95
55	10.2.167.96/28	10.2.167.97 – 10.2.167.110	10.2.167.111
56	10.2.167.112/28	10.2.167.113 – 10.2.167.126	10.2.167.127
57	10.2.167.128/28	10.2.167.129 – 10.2.167.142	10.2.167.143
58	10.2.167.144/28	10.2.167.145 – 10.2.167.158	10.2.167.159
59	10.2.167.160/28	10.2.167.161 – 10.2.167.174	10.2.167.175
60	10.2.167.176/28	10.2.167.177 – 10.2.167.190	10.2.167.191
61	10.2.167.192/28	10.2.167.193 – 10.2.167.206	10.2.167.207
62	10.2.167.208/28	10.2.167.209 – 10.2.167.222	10.2.167.223
63	10.2.167.224/28	10.2.167.225 – 10.2.167.238	10.2.167.239
64	10.2.167.240/28	10.2.167.241 – 10.2.167.254	10.2.167.255

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 →