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)10.167.144.0/23

network10.167.144.0/23

broadcast10.167.145.255

first host10.167.144.1

last host10.167.145.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.167.144.0/23

address00001010.10100111.10010000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100111.10010000.00000000

broadcast00001010.10100111.10010001.11111111

green = network part, grey = host part

hex0x0aa79000

decimal178753536

reverse dns0.144.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:9000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.144.0/29	10.167.144.1 – 10.167.144.6	10.167.144.7
2	10.167.144.8/29	10.167.144.9 – 10.167.144.14	10.167.144.15
3	10.167.144.16/29	10.167.144.17 – 10.167.144.22	10.167.144.23
4	10.167.144.24/29	10.167.144.25 – 10.167.144.30	10.167.144.31
5	10.167.144.32/29	10.167.144.33 – 10.167.144.38	10.167.144.39
6	10.167.144.40/29	10.167.144.41 – 10.167.144.46	10.167.144.47
7	10.167.144.48/29	10.167.144.49 – 10.167.144.54	10.167.144.55
8	10.167.144.56/29	10.167.144.57 – 10.167.144.62	10.167.144.63
9	10.167.144.64/29	10.167.144.65 – 10.167.144.70	10.167.144.71
10	10.167.144.72/29	10.167.144.73 – 10.167.144.78	10.167.144.79
11	10.167.144.80/29	10.167.144.81 – 10.167.144.86	10.167.144.87
12	10.167.144.88/29	10.167.144.89 – 10.167.144.94	10.167.144.95
13	10.167.144.96/29	10.167.144.97 – 10.167.144.102	10.167.144.103
14	10.167.144.104/29	10.167.144.105 – 10.167.144.110	10.167.144.111
15	10.167.144.112/29	10.167.144.113 – 10.167.144.118	10.167.144.119
16	10.167.144.120/29	10.167.144.121 – 10.167.144.126	10.167.144.127
17	10.167.144.128/29	10.167.144.129 – 10.167.144.134	10.167.144.135
18	10.167.144.136/29	10.167.144.137 – 10.167.144.142	10.167.144.143
19	10.167.144.144/29	10.167.144.145 – 10.167.144.150	10.167.144.151
20	10.167.144.152/29	10.167.144.153 – 10.167.144.158	10.167.144.159
21	10.167.144.160/29	10.167.144.161 – 10.167.144.166	10.167.144.167
22	10.167.144.168/29	10.167.144.169 – 10.167.144.174	10.167.144.175
23	10.167.144.176/29	10.167.144.177 – 10.167.144.182	10.167.144.183
24	10.167.144.184/29	10.167.144.185 – 10.167.144.190	10.167.144.191
25	10.167.144.192/29	10.167.144.193 – 10.167.144.198	10.167.144.199
26	10.167.144.200/29	10.167.144.201 – 10.167.144.206	10.167.144.207
27	10.167.144.208/29	10.167.144.209 – 10.167.144.214	10.167.144.215
28	10.167.144.216/29	10.167.144.217 – 10.167.144.222	10.167.144.223
29	10.167.144.224/29	10.167.144.225 – 10.167.144.230	10.167.144.231
30	10.167.144.232/29	10.167.144.233 – 10.167.144.238	10.167.144.239
31	10.167.144.240/29	10.167.144.241 – 10.167.144.246	10.167.144.247
32	10.167.144.248/29	10.167.144.249 – 10.167.144.254	10.167.144.255
33	10.167.145.0/29	10.167.145.1 – 10.167.145.6	10.167.145.7
34	10.167.145.8/29	10.167.145.9 – 10.167.145.14	10.167.145.15
35	10.167.145.16/29	10.167.145.17 – 10.167.145.22	10.167.145.23
36	10.167.145.24/29	10.167.145.25 – 10.167.145.30	10.167.145.31
37	10.167.145.32/29	10.167.145.33 – 10.167.145.38	10.167.145.39
38	10.167.145.40/29	10.167.145.41 – 10.167.145.46	10.167.145.47
39	10.167.145.48/29	10.167.145.49 – 10.167.145.54	10.167.145.55
40	10.167.145.56/29	10.167.145.57 – 10.167.145.62	10.167.145.63
41	10.167.145.64/29	10.167.145.65 – 10.167.145.70	10.167.145.71
42	10.167.145.72/29	10.167.145.73 – 10.167.145.78	10.167.145.79
43	10.167.145.80/29	10.167.145.81 – 10.167.145.86	10.167.145.87
44	10.167.145.88/29	10.167.145.89 – 10.167.145.94	10.167.145.95
45	10.167.145.96/29	10.167.145.97 – 10.167.145.102	10.167.145.103
46	10.167.145.104/29	10.167.145.105 – 10.167.145.110	10.167.145.111
47	10.167.145.112/29	10.167.145.113 – 10.167.145.118	10.167.145.119
48	10.167.145.120/29	10.167.145.121 – 10.167.145.126	10.167.145.127
49	10.167.145.128/29	10.167.145.129 – 10.167.145.134	10.167.145.135
50	10.167.145.136/29	10.167.145.137 – 10.167.145.142	10.167.145.143
51	10.167.145.144/29	10.167.145.145 – 10.167.145.150	10.167.145.151
52	10.167.145.152/29	10.167.145.153 – 10.167.145.158	10.167.145.159
53	10.167.145.160/29	10.167.145.161 – 10.167.145.166	10.167.145.167
54	10.167.145.168/29	10.167.145.169 – 10.167.145.174	10.167.145.175
55	10.167.145.176/29	10.167.145.177 – 10.167.145.182	10.167.145.183
56	10.167.145.184/29	10.167.145.185 – 10.167.145.190	10.167.145.191
57	10.167.145.192/29	10.167.145.193 – 10.167.145.198	10.167.145.199
58	10.167.145.200/29	10.167.145.201 – 10.167.145.206	10.167.145.207
59	10.167.145.208/29	10.167.145.209 – 10.167.145.214	10.167.145.215
60	10.167.145.216/29	10.167.145.217 – 10.167.145.222	10.167.145.223
61	10.167.145.224/29	10.167.145.225 – 10.167.145.230	10.167.145.231
62	10.167.145.232/29	10.167.145.233 – 10.167.145.238	10.167.145.239
63	10.167.145.240/29	10.167.145.241 – 10.167.145.246	10.167.145.247
64	10.167.145.248/29	10.167.145.249 – 10.167.145.254	10.167.145.255

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 →