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)10.2.62.0/23

network10.2.62.0/23

broadcast10.2.63.255

first host10.2.62.1

last host10.2.63.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.62.0/23

address00001010.00000010.00111110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.00111110.00000000

broadcast00001010.00000010.00111111.11111111

green = network part, grey = host part

hex0x0a023e00

decimal167919104

reverse dns0.62.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3e00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.62.0/29	10.2.62.1 – 10.2.62.6	10.2.62.7
2	10.2.62.8/29	10.2.62.9 – 10.2.62.14	10.2.62.15
3	10.2.62.16/29	10.2.62.17 – 10.2.62.22	10.2.62.23
4	10.2.62.24/29	10.2.62.25 – 10.2.62.30	10.2.62.31
5	10.2.62.32/29	10.2.62.33 – 10.2.62.38	10.2.62.39
6	10.2.62.40/29	10.2.62.41 – 10.2.62.46	10.2.62.47
7	10.2.62.48/29	10.2.62.49 – 10.2.62.54	10.2.62.55
8	10.2.62.56/29	10.2.62.57 – 10.2.62.62	10.2.62.63
9	10.2.62.64/29	10.2.62.65 – 10.2.62.70	10.2.62.71
10	10.2.62.72/29	10.2.62.73 – 10.2.62.78	10.2.62.79
11	10.2.62.80/29	10.2.62.81 – 10.2.62.86	10.2.62.87
12	10.2.62.88/29	10.2.62.89 – 10.2.62.94	10.2.62.95
13	10.2.62.96/29	10.2.62.97 – 10.2.62.102	10.2.62.103
14	10.2.62.104/29	10.2.62.105 – 10.2.62.110	10.2.62.111
15	10.2.62.112/29	10.2.62.113 – 10.2.62.118	10.2.62.119
16	10.2.62.120/29	10.2.62.121 – 10.2.62.126	10.2.62.127
17	10.2.62.128/29	10.2.62.129 – 10.2.62.134	10.2.62.135
18	10.2.62.136/29	10.2.62.137 – 10.2.62.142	10.2.62.143
19	10.2.62.144/29	10.2.62.145 – 10.2.62.150	10.2.62.151
20	10.2.62.152/29	10.2.62.153 – 10.2.62.158	10.2.62.159
21	10.2.62.160/29	10.2.62.161 – 10.2.62.166	10.2.62.167
22	10.2.62.168/29	10.2.62.169 – 10.2.62.174	10.2.62.175
23	10.2.62.176/29	10.2.62.177 – 10.2.62.182	10.2.62.183
24	10.2.62.184/29	10.2.62.185 – 10.2.62.190	10.2.62.191
25	10.2.62.192/29	10.2.62.193 – 10.2.62.198	10.2.62.199
26	10.2.62.200/29	10.2.62.201 – 10.2.62.206	10.2.62.207
27	10.2.62.208/29	10.2.62.209 – 10.2.62.214	10.2.62.215
28	10.2.62.216/29	10.2.62.217 – 10.2.62.222	10.2.62.223
29	10.2.62.224/29	10.2.62.225 – 10.2.62.230	10.2.62.231
30	10.2.62.232/29	10.2.62.233 – 10.2.62.238	10.2.62.239
31	10.2.62.240/29	10.2.62.241 – 10.2.62.246	10.2.62.247
32	10.2.62.248/29	10.2.62.249 – 10.2.62.254	10.2.62.255
33	10.2.63.0/29	10.2.63.1 – 10.2.63.6	10.2.63.7
34	10.2.63.8/29	10.2.63.9 – 10.2.63.14	10.2.63.15
35	10.2.63.16/29	10.2.63.17 – 10.2.63.22	10.2.63.23
36	10.2.63.24/29	10.2.63.25 – 10.2.63.30	10.2.63.31
37	10.2.63.32/29	10.2.63.33 – 10.2.63.38	10.2.63.39
38	10.2.63.40/29	10.2.63.41 – 10.2.63.46	10.2.63.47
39	10.2.63.48/29	10.2.63.49 – 10.2.63.54	10.2.63.55
40	10.2.63.56/29	10.2.63.57 – 10.2.63.62	10.2.63.63
41	10.2.63.64/29	10.2.63.65 – 10.2.63.70	10.2.63.71
42	10.2.63.72/29	10.2.63.73 – 10.2.63.78	10.2.63.79
43	10.2.63.80/29	10.2.63.81 – 10.2.63.86	10.2.63.87
44	10.2.63.88/29	10.2.63.89 – 10.2.63.94	10.2.63.95
45	10.2.63.96/29	10.2.63.97 – 10.2.63.102	10.2.63.103
46	10.2.63.104/29	10.2.63.105 – 10.2.63.110	10.2.63.111
47	10.2.63.112/29	10.2.63.113 – 10.2.63.118	10.2.63.119
48	10.2.63.120/29	10.2.63.121 – 10.2.63.126	10.2.63.127
49	10.2.63.128/29	10.2.63.129 – 10.2.63.134	10.2.63.135
50	10.2.63.136/29	10.2.63.137 – 10.2.63.142	10.2.63.143
51	10.2.63.144/29	10.2.63.145 – 10.2.63.150	10.2.63.151
52	10.2.63.152/29	10.2.63.153 – 10.2.63.158	10.2.63.159
53	10.2.63.160/29	10.2.63.161 – 10.2.63.166	10.2.63.167
54	10.2.63.168/29	10.2.63.169 – 10.2.63.174	10.2.63.175
55	10.2.63.176/29	10.2.63.177 – 10.2.63.182	10.2.63.183
56	10.2.63.184/29	10.2.63.185 – 10.2.63.190	10.2.63.191
57	10.2.63.192/29	10.2.63.193 – 10.2.63.198	10.2.63.199
58	10.2.63.200/29	10.2.63.201 – 10.2.63.206	10.2.63.207
59	10.2.63.208/29	10.2.63.209 – 10.2.63.214	10.2.63.215
60	10.2.63.216/29	10.2.63.217 – 10.2.63.222	10.2.63.223
61	10.2.63.224/29	10.2.63.225 – 10.2.63.230	10.2.63.231
62	10.2.63.232/29	10.2.63.233 – 10.2.63.238	10.2.63.239
63	10.2.63.240/29	10.2.63.241 – 10.2.63.246	10.2.63.247
64	10.2.63.248/29	10.2.63.249 – 10.2.63.254	10.2.63.255

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