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)10.167.140.0/23

network10.167.140.0/23

broadcast10.167.141.255

first host10.167.140.1

last host10.167.141.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.167.140.0/23

address00001010.10100111.10001100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100111.10001100.00000000

broadcast00001010.10100111.10001101.11111111

green = network part, grey = host part

hex0x0aa78c00

decimal178752512

reverse dns0.140.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8c00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.140.0/29	10.167.140.1 – 10.167.140.6	10.167.140.7
2	10.167.140.8/29	10.167.140.9 – 10.167.140.14	10.167.140.15
3	10.167.140.16/29	10.167.140.17 – 10.167.140.22	10.167.140.23
4	10.167.140.24/29	10.167.140.25 – 10.167.140.30	10.167.140.31
5	10.167.140.32/29	10.167.140.33 – 10.167.140.38	10.167.140.39
6	10.167.140.40/29	10.167.140.41 – 10.167.140.46	10.167.140.47
7	10.167.140.48/29	10.167.140.49 – 10.167.140.54	10.167.140.55
8	10.167.140.56/29	10.167.140.57 – 10.167.140.62	10.167.140.63
9	10.167.140.64/29	10.167.140.65 – 10.167.140.70	10.167.140.71
10	10.167.140.72/29	10.167.140.73 – 10.167.140.78	10.167.140.79
11	10.167.140.80/29	10.167.140.81 – 10.167.140.86	10.167.140.87
12	10.167.140.88/29	10.167.140.89 – 10.167.140.94	10.167.140.95
13	10.167.140.96/29	10.167.140.97 – 10.167.140.102	10.167.140.103
14	10.167.140.104/29	10.167.140.105 – 10.167.140.110	10.167.140.111
15	10.167.140.112/29	10.167.140.113 – 10.167.140.118	10.167.140.119
16	10.167.140.120/29	10.167.140.121 – 10.167.140.126	10.167.140.127
17	10.167.140.128/29	10.167.140.129 – 10.167.140.134	10.167.140.135
18	10.167.140.136/29	10.167.140.137 – 10.167.140.142	10.167.140.143
19	10.167.140.144/29	10.167.140.145 – 10.167.140.150	10.167.140.151
20	10.167.140.152/29	10.167.140.153 – 10.167.140.158	10.167.140.159
21	10.167.140.160/29	10.167.140.161 – 10.167.140.166	10.167.140.167
22	10.167.140.168/29	10.167.140.169 – 10.167.140.174	10.167.140.175
23	10.167.140.176/29	10.167.140.177 – 10.167.140.182	10.167.140.183
24	10.167.140.184/29	10.167.140.185 – 10.167.140.190	10.167.140.191
25	10.167.140.192/29	10.167.140.193 – 10.167.140.198	10.167.140.199
26	10.167.140.200/29	10.167.140.201 – 10.167.140.206	10.167.140.207
27	10.167.140.208/29	10.167.140.209 – 10.167.140.214	10.167.140.215
28	10.167.140.216/29	10.167.140.217 – 10.167.140.222	10.167.140.223
29	10.167.140.224/29	10.167.140.225 – 10.167.140.230	10.167.140.231
30	10.167.140.232/29	10.167.140.233 – 10.167.140.238	10.167.140.239
31	10.167.140.240/29	10.167.140.241 – 10.167.140.246	10.167.140.247
32	10.167.140.248/29	10.167.140.249 – 10.167.140.254	10.167.140.255
33	10.167.141.0/29	10.167.141.1 – 10.167.141.6	10.167.141.7
34	10.167.141.8/29	10.167.141.9 – 10.167.141.14	10.167.141.15
35	10.167.141.16/29	10.167.141.17 – 10.167.141.22	10.167.141.23
36	10.167.141.24/29	10.167.141.25 – 10.167.141.30	10.167.141.31
37	10.167.141.32/29	10.167.141.33 – 10.167.141.38	10.167.141.39
38	10.167.141.40/29	10.167.141.41 – 10.167.141.46	10.167.141.47
39	10.167.141.48/29	10.167.141.49 – 10.167.141.54	10.167.141.55
40	10.167.141.56/29	10.167.141.57 – 10.167.141.62	10.167.141.63
41	10.167.141.64/29	10.167.141.65 – 10.167.141.70	10.167.141.71
42	10.167.141.72/29	10.167.141.73 – 10.167.141.78	10.167.141.79
43	10.167.141.80/29	10.167.141.81 – 10.167.141.86	10.167.141.87
44	10.167.141.88/29	10.167.141.89 – 10.167.141.94	10.167.141.95
45	10.167.141.96/29	10.167.141.97 – 10.167.141.102	10.167.141.103
46	10.167.141.104/29	10.167.141.105 – 10.167.141.110	10.167.141.111
47	10.167.141.112/29	10.167.141.113 – 10.167.141.118	10.167.141.119
48	10.167.141.120/29	10.167.141.121 – 10.167.141.126	10.167.141.127
49	10.167.141.128/29	10.167.141.129 – 10.167.141.134	10.167.141.135
50	10.167.141.136/29	10.167.141.137 – 10.167.141.142	10.167.141.143
51	10.167.141.144/29	10.167.141.145 – 10.167.141.150	10.167.141.151
52	10.167.141.152/29	10.167.141.153 – 10.167.141.158	10.167.141.159
53	10.167.141.160/29	10.167.141.161 – 10.167.141.166	10.167.141.167
54	10.167.141.168/29	10.167.141.169 – 10.167.141.174	10.167.141.175
55	10.167.141.176/29	10.167.141.177 – 10.167.141.182	10.167.141.183
56	10.167.141.184/29	10.167.141.185 – 10.167.141.190	10.167.141.191
57	10.167.141.192/29	10.167.141.193 – 10.167.141.198	10.167.141.199
58	10.167.141.200/29	10.167.141.201 – 10.167.141.206	10.167.141.207
59	10.167.141.208/29	10.167.141.209 – 10.167.141.214	10.167.141.215
60	10.167.141.216/29	10.167.141.217 – 10.167.141.222	10.167.141.223
61	10.167.141.224/29	10.167.141.225 – 10.167.141.230	10.167.141.231
62	10.167.141.232/29	10.167.141.233 – 10.167.141.238	10.167.141.239
63	10.167.141.240/29	10.167.141.241 – 10.167.141.246	10.167.141.247
64	10.167.141.248/29	10.167.141.249 – 10.167.141.254	10.167.141.255

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 →