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)10.1.142.0/23

network10.1.142.0/23

broadcast10.1.143.255

first host10.1.142.1

last host10.1.143.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.142.0/23

address00001010.00000001.10001110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.10001110.00000000

broadcast00001010.00000001.10001111.11111111

green = network part, grey = host part

hex0x0a018e00

decimal167874048

reverse dns0.142.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:8e00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.1.142.0/29	10.1.142.1 – 10.1.142.6	10.1.142.7
2	10.1.142.8/29	10.1.142.9 – 10.1.142.14	10.1.142.15
3	10.1.142.16/29	10.1.142.17 – 10.1.142.22	10.1.142.23
4	10.1.142.24/29	10.1.142.25 – 10.1.142.30	10.1.142.31
5	10.1.142.32/29	10.1.142.33 – 10.1.142.38	10.1.142.39
6	10.1.142.40/29	10.1.142.41 – 10.1.142.46	10.1.142.47
7	10.1.142.48/29	10.1.142.49 – 10.1.142.54	10.1.142.55
8	10.1.142.56/29	10.1.142.57 – 10.1.142.62	10.1.142.63
9	10.1.142.64/29	10.1.142.65 – 10.1.142.70	10.1.142.71
10	10.1.142.72/29	10.1.142.73 – 10.1.142.78	10.1.142.79
11	10.1.142.80/29	10.1.142.81 – 10.1.142.86	10.1.142.87
12	10.1.142.88/29	10.1.142.89 – 10.1.142.94	10.1.142.95
13	10.1.142.96/29	10.1.142.97 – 10.1.142.102	10.1.142.103
14	10.1.142.104/29	10.1.142.105 – 10.1.142.110	10.1.142.111
15	10.1.142.112/29	10.1.142.113 – 10.1.142.118	10.1.142.119
16	10.1.142.120/29	10.1.142.121 – 10.1.142.126	10.1.142.127
17	10.1.142.128/29	10.1.142.129 – 10.1.142.134	10.1.142.135
18	10.1.142.136/29	10.1.142.137 – 10.1.142.142	10.1.142.143
19	10.1.142.144/29	10.1.142.145 – 10.1.142.150	10.1.142.151
20	10.1.142.152/29	10.1.142.153 – 10.1.142.158	10.1.142.159
21	10.1.142.160/29	10.1.142.161 – 10.1.142.166	10.1.142.167
22	10.1.142.168/29	10.1.142.169 – 10.1.142.174	10.1.142.175
23	10.1.142.176/29	10.1.142.177 – 10.1.142.182	10.1.142.183
24	10.1.142.184/29	10.1.142.185 – 10.1.142.190	10.1.142.191
25	10.1.142.192/29	10.1.142.193 – 10.1.142.198	10.1.142.199
26	10.1.142.200/29	10.1.142.201 – 10.1.142.206	10.1.142.207
27	10.1.142.208/29	10.1.142.209 – 10.1.142.214	10.1.142.215
28	10.1.142.216/29	10.1.142.217 – 10.1.142.222	10.1.142.223
29	10.1.142.224/29	10.1.142.225 – 10.1.142.230	10.1.142.231
30	10.1.142.232/29	10.1.142.233 – 10.1.142.238	10.1.142.239
31	10.1.142.240/29	10.1.142.241 – 10.1.142.246	10.1.142.247
32	10.1.142.248/29	10.1.142.249 – 10.1.142.254	10.1.142.255
33	10.1.143.0/29	10.1.143.1 – 10.1.143.6	10.1.143.7
34	10.1.143.8/29	10.1.143.9 – 10.1.143.14	10.1.143.15
35	10.1.143.16/29	10.1.143.17 – 10.1.143.22	10.1.143.23
36	10.1.143.24/29	10.1.143.25 – 10.1.143.30	10.1.143.31
37	10.1.143.32/29	10.1.143.33 – 10.1.143.38	10.1.143.39
38	10.1.143.40/29	10.1.143.41 – 10.1.143.46	10.1.143.47
39	10.1.143.48/29	10.1.143.49 – 10.1.143.54	10.1.143.55
40	10.1.143.56/29	10.1.143.57 – 10.1.143.62	10.1.143.63
41	10.1.143.64/29	10.1.143.65 – 10.1.143.70	10.1.143.71
42	10.1.143.72/29	10.1.143.73 – 10.1.143.78	10.1.143.79
43	10.1.143.80/29	10.1.143.81 – 10.1.143.86	10.1.143.87
44	10.1.143.88/29	10.1.143.89 – 10.1.143.94	10.1.143.95
45	10.1.143.96/29	10.1.143.97 – 10.1.143.102	10.1.143.103
46	10.1.143.104/29	10.1.143.105 – 10.1.143.110	10.1.143.111
47	10.1.143.112/29	10.1.143.113 – 10.1.143.118	10.1.143.119
48	10.1.143.120/29	10.1.143.121 – 10.1.143.126	10.1.143.127
49	10.1.143.128/29	10.1.143.129 – 10.1.143.134	10.1.143.135
50	10.1.143.136/29	10.1.143.137 – 10.1.143.142	10.1.143.143
51	10.1.143.144/29	10.1.143.145 – 10.1.143.150	10.1.143.151
52	10.1.143.152/29	10.1.143.153 – 10.1.143.158	10.1.143.159
53	10.1.143.160/29	10.1.143.161 – 10.1.143.166	10.1.143.167
54	10.1.143.168/29	10.1.143.169 – 10.1.143.174	10.1.143.175
55	10.1.143.176/29	10.1.143.177 – 10.1.143.182	10.1.143.183
56	10.1.143.184/29	10.1.143.185 – 10.1.143.190	10.1.143.191
57	10.1.143.192/29	10.1.143.193 – 10.1.143.198	10.1.143.199
58	10.1.143.200/29	10.1.143.201 – 10.1.143.206	10.1.143.207
59	10.1.143.208/29	10.1.143.209 – 10.1.143.214	10.1.143.215
60	10.1.143.216/29	10.1.143.217 – 10.1.143.222	10.1.143.223
61	10.1.143.224/29	10.1.143.225 – 10.1.143.230	10.1.143.231
62	10.1.143.232/29	10.1.143.233 – 10.1.143.238	10.1.143.239
63	10.1.143.240/29	10.1.143.241 – 10.1.143.246	10.1.143.247
64	10.1.143.248/29	10.1.143.249 – 10.1.143.254	10.1.143.255

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 →