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)10.3.128.0/22

network10.3.128.0/22

broadcast10.3.131.255

first host10.3.128.1

last host10.3.131.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.3.128.0/22

address00001010.00000011.10000000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000011.10000000.00000000

broadcast00001010.00000011.10000011.11111111

green = network part, grey = host part

hex0x0a038000

decimal168001536

reverse dns0.128.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:8000

/22 split into /28 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.128.0/28	10.3.128.1 – 10.3.128.14	10.3.128.15
2	10.3.128.16/28	10.3.128.17 – 10.3.128.30	10.3.128.31
3	10.3.128.32/28	10.3.128.33 – 10.3.128.46	10.3.128.47
4	10.3.128.48/28	10.3.128.49 – 10.3.128.62	10.3.128.63
5	10.3.128.64/28	10.3.128.65 – 10.3.128.78	10.3.128.79
6	10.3.128.80/28	10.3.128.81 – 10.3.128.94	10.3.128.95
7	10.3.128.96/28	10.3.128.97 – 10.3.128.110	10.3.128.111
8	10.3.128.112/28	10.3.128.113 – 10.3.128.126	10.3.128.127
9	10.3.128.128/28	10.3.128.129 – 10.3.128.142	10.3.128.143
10	10.3.128.144/28	10.3.128.145 – 10.3.128.158	10.3.128.159
11	10.3.128.160/28	10.3.128.161 – 10.3.128.174	10.3.128.175
12	10.3.128.176/28	10.3.128.177 – 10.3.128.190	10.3.128.191
13	10.3.128.192/28	10.3.128.193 – 10.3.128.206	10.3.128.207
14	10.3.128.208/28	10.3.128.209 – 10.3.128.222	10.3.128.223
15	10.3.128.224/28	10.3.128.225 – 10.3.128.238	10.3.128.239
16	10.3.128.240/28	10.3.128.241 – 10.3.128.254	10.3.128.255
17	10.3.129.0/28	10.3.129.1 – 10.3.129.14	10.3.129.15
18	10.3.129.16/28	10.3.129.17 – 10.3.129.30	10.3.129.31
19	10.3.129.32/28	10.3.129.33 – 10.3.129.46	10.3.129.47
20	10.3.129.48/28	10.3.129.49 – 10.3.129.62	10.3.129.63
21	10.3.129.64/28	10.3.129.65 – 10.3.129.78	10.3.129.79
22	10.3.129.80/28	10.3.129.81 – 10.3.129.94	10.3.129.95
23	10.3.129.96/28	10.3.129.97 – 10.3.129.110	10.3.129.111
24	10.3.129.112/28	10.3.129.113 – 10.3.129.126	10.3.129.127
25	10.3.129.128/28	10.3.129.129 – 10.3.129.142	10.3.129.143
26	10.3.129.144/28	10.3.129.145 – 10.3.129.158	10.3.129.159
27	10.3.129.160/28	10.3.129.161 – 10.3.129.174	10.3.129.175
28	10.3.129.176/28	10.3.129.177 – 10.3.129.190	10.3.129.191
29	10.3.129.192/28	10.3.129.193 – 10.3.129.206	10.3.129.207
30	10.3.129.208/28	10.3.129.209 – 10.3.129.222	10.3.129.223
31	10.3.129.224/28	10.3.129.225 – 10.3.129.238	10.3.129.239
32	10.3.129.240/28	10.3.129.241 – 10.3.129.254	10.3.129.255
33	10.3.130.0/28	10.3.130.1 – 10.3.130.14	10.3.130.15
34	10.3.130.16/28	10.3.130.17 – 10.3.130.30	10.3.130.31
35	10.3.130.32/28	10.3.130.33 – 10.3.130.46	10.3.130.47
36	10.3.130.48/28	10.3.130.49 – 10.3.130.62	10.3.130.63
37	10.3.130.64/28	10.3.130.65 – 10.3.130.78	10.3.130.79
38	10.3.130.80/28	10.3.130.81 – 10.3.130.94	10.3.130.95
39	10.3.130.96/28	10.3.130.97 – 10.3.130.110	10.3.130.111
40	10.3.130.112/28	10.3.130.113 – 10.3.130.126	10.3.130.127
41	10.3.130.128/28	10.3.130.129 – 10.3.130.142	10.3.130.143
42	10.3.130.144/28	10.3.130.145 – 10.3.130.158	10.3.130.159
43	10.3.130.160/28	10.3.130.161 – 10.3.130.174	10.3.130.175
44	10.3.130.176/28	10.3.130.177 – 10.3.130.190	10.3.130.191
45	10.3.130.192/28	10.3.130.193 – 10.3.130.206	10.3.130.207
46	10.3.130.208/28	10.3.130.209 – 10.3.130.222	10.3.130.223
47	10.3.130.224/28	10.3.130.225 – 10.3.130.238	10.3.130.239
48	10.3.130.240/28	10.3.130.241 – 10.3.130.254	10.3.130.255
49	10.3.131.0/28	10.3.131.1 – 10.3.131.14	10.3.131.15
50	10.3.131.16/28	10.3.131.17 – 10.3.131.30	10.3.131.31
51	10.3.131.32/28	10.3.131.33 – 10.3.131.46	10.3.131.47
52	10.3.131.48/28	10.3.131.49 – 10.3.131.62	10.3.131.63
53	10.3.131.64/28	10.3.131.65 – 10.3.131.78	10.3.131.79
54	10.3.131.80/28	10.3.131.81 – 10.3.131.94	10.3.131.95
55	10.3.131.96/28	10.3.131.97 – 10.3.131.110	10.3.131.111
56	10.3.131.112/28	10.3.131.113 – 10.3.131.126	10.3.131.127
57	10.3.131.128/28	10.3.131.129 – 10.3.131.142	10.3.131.143
58	10.3.131.144/28	10.3.131.145 – 10.3.131.158	10.3.131.159
59	10.3.131.160/28	10.3.131.161 – 10.3.131.174	10.3.131.175
60	10.3.131.176/28	10.3.131.177 – 10.3.131.190	10.3.131.191
61	10.3.131.192/28	10.3.131.193 – 10.3.131.206	10.3.131.207
62	10.3.131.208/28	10.3.131.209 – 10.3.131.222	10.3.131.223
63	10.3.131.224/28	10.3.131.225 – 10.3.131.238	10.3.131.239
64	10.3.131.240/28	10.3.131.241 – 10.3.131.254	10.3.131.255

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 →