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)10.149.40.0/22

network10.149.40.0/22

broadcast10.149.43.255

first host10.149.40.1

last host10.149.43.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.149.40.0/22

address00001010.10010101.00101000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.10010101.00101000.00000000

broadcast00001010.10010101.00101011.11111111

green = network part, grey = host part

hex0x0a952800

decimal177547264

reverse dns0.40.149.10.in-addr.arpa

ipv4-mapped::ffff:a95:2800

/22 split into /28 · 64 subnets

close ×

#	network	host range	broadcast
1	10.149.40.0/28	10.149.40.1 – 10.149.40.14	10.149.40.15
2	10.149.40.16/28	10.149.40.17 – 10.149.40.30	10.149.40.31
3	10.149.40.32/28	10.149.40.33 – 10.149.40.46	10.149.40.47
4	10.149.40.48/28	10.149.40.49 – 10.149.40.62	10.149.40.63
5	10.149.40.64/28	10.149.40.65 – 10.149.40.78	10.149.40.79
6	10.149.40.80/28	10.149.40.81 – 10.149.40.94	10.149.40.95
7	10.149.40.96/28	10.149.40.97 – 10.149.40.110	10.149.40.111
8	10.149.40.112/28	10.149.40.113 – 10.149.40.126	10.149.40.127
9	10.149.40.128/28	10.149.40.129 – 10.149.40.142	10.149.40.143
10	10.149.40.144/28	10.149.40.145 – 10.149.40.158	10.149.40.159
11	10.149.40.160/28	10.149.40.161 – 10.149.40.174	10.149.40.175
12	10.149.40.176/28	10.149.40.177 – 10.149.40.190	10.149.40.191
13	10.149.40.192/28	10.149.40.193 – 10.149.40.206	10.149.40.207
14	10.149.40.208/28	10.149.40.209 – 10.149.40.222	10.149.40.223
15	10.149.40.224/28	10.149.40.225 – 10.149.40.238	10.149.40.239
16	10.149.40.240/28	10.149.40.241 – 10.149.40.254	10.149.40.255
17	10.149.41.0/28	10.149.41.1 – 10.149.41.14	10.149.41.15
18	10.149.41.16/28	10.149.41.17 – 10.149.41.30	10.149.41.31
19	10.149.41.32/28	10.149.41.33 – 10.149.41.46	10.149.41.47
20	10.149.41.48/28	10.149.41.49 – 10.149.41.62	10.149.41.63
21	10.149.41.64/28	10.149.41.65 – 10.149.41.78	10.149.41.79
22	10.149.41.80/28	10.149.41.81 – 10.149.41.94	10.149.41.95
23	10.149.41.96/28	10.149.41.97 – 10.149.41.110	10.149.41.111
24	10.149.41.112/28	10.149.41.113 – 10.149.41.126	10.149.41.127
25	10.149.41.128/28	10.149.41.129 – 10.149.41.142	10.149.41.143
26	10.149.41.144/28	10.149.41.145 – 10.149.41.158	10.149.41.159
27	10.149.41.160/28	10.149.41.161 – 10.149.41.174	10.149.41.175
28	10.149.41.176/28	10.149.41.177 – 10.149.41.190	10.149.41.191
29	10.149.41.192/28	10.149.41.193 – 10.149.41.206	10.149.41.207
30	10.149.41.208/28	10.149.41.209 – 10.149.41.222	10.149.41.223
31	10.149.41.224/28	10.149.41.225 – 10.149.41.238	10.149.41.239
32	10.149.41.240/28	10.149.41.241 – 10.149.41.254	10.149.41.255
33	10.149.42.0/28	10.149.42.1 – 10.149.42.14	10.149.42.15
34	10.149.42.16/28	10.149.42.17 – 10.149.42.30	10.149.42.31
35	10.149.42.32/28	10.149.42.33 – 10.149.42.46	10.149.42.47
36	10.149.42.48/28	10.149.42.49 – 10.149.42.62	10.149.42.63
37	10.149.42.64/28	10.149.42.65 – 10.149.42.78	10.149.42.79
38	10.149.42.80/28	10.149.42.81 – 10.149.42.94	10.149.42.95
39	10.149.42.96/28	10.149.42.97 – 10.149.42.110	10.149.42.111
40	10.149.42.112/28	10.149.42.113 – 10.149.42.126	10.149.42.127
41	10.149.42.128/28	10.149.42.129 – 10.149.42.142	10.149.42.143
42	10.149.42.144/28	10.149.42.145 – 10.149.42.158	10.149.42.159
43	10.149.42.160/28	10.149.42.161 – 10.149.42.174	10.149.42.175
44	10.149.42.176/28	10.149.42.177 – 10.149.42.190	10.149.42.191
45	10.149.42.192/28	10.149.42.193 – 10.149.42.206	10.149.42.207
46	10.149.42.208/28	10.149.42.209 – 10.149.42.222	10.149.42.223
47	10.149.42.224/28	10.149.42.225 – 10.149.42.238	10.149.42.239
48	10.149.42.240/28	10.149.42.241 – 10.149.42.254	10.149.42.255
49	10.149.43.0/28	10.149.43.1 – 10.149.43.14	10.149.43.15
50	10.149.43.16/28	10.149.43.17 – 10.149.43.30	10.149.43.31
51	10.149.43.32/28	10.149.43.33 – 10.149.43.46	10.149.43.47
52	10.149.43.48/28	10.149.43.49 – 10.149.43.62	10.149.43.63
53	10.149.43.64/28	10.149.43.65 – 10.149.43.78	10.149.43.79
54	10.149.43.80/28	10.149.43.81 – 10.149.43.94	10.149.43.95
55	10.149.43.96/28	10.149.43.97 – 10.149.43.110	10.149.43.111
56	10.149.43.112/28	10.149.43.113 – 10.149.43.126	10.149.43.127
57	10.149.43.128/28	10.149.43.129 – 10.149.43.142	10.149.43.143
58	10.149.43.144/28	10.149.43.145 – 10.149.43.158	10.149.43.159
59	10.149.43.160/28	10.149.43.161 – 10.149.43.174	10.149.43.175
60	10.149.43.176/28	10.149.43.177 – 10.149.43.190	10.149.43.191
61	10.149.43.192/28	10.149.43.193 – 10.149.43.206	10.149.43.207
62	10.149.43.208/28	10.149.43.209 – 10.149.43.222	10.149.43.223
63	10.149.43.224/28	10.149.43.225 – 10.149.43.238	10.149.43.239
64	10.149.43.240/28	10.149.43.241 – 10.149.43.254	10.149.43.255

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 →