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)10.1.162.0/23

network10.1.162.0/23

broadcast10.1.163.255

first host10.1.162.1

last host10.1.163.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.162.0/23

address00001010.00000001.10100010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.10100010.00000000

broadcast00001010.00000001.10100011.11111111

green = network part, grey = host part

hex0x0a01a200

decimal167879168

reverse dns0.162.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:a200

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.1.162.0/29	10.1.162.1 – 10.1.162.6	10.1.162.7
2	10.1.162.8/29	10.1.162.9 – 10.1.162.14	10.1.162.15
3	10.1.162.16/29	10.1.162.17 – 10.1.162.22	10.1.162.23
4	10.1.162.24/29	10.1.162.25 – 10.1.162.30	10.1.162.31
5	10.1.162.32/29	10.1.162.33 – 10.1.162.38	10.1.162.39
6	10.1.162.40/29	10.1.162.41 – 10.1.162.46	10.1.162.47
7	10.1.162.48/29	10.1.162.49 – 10.1.162.54	10.1.162.55
8	10.1.162.56/29	10.1.162.57 – 10.1.162.62	10.1.162.63
9	10.1.162.64/29	10.1.162.65 – 10.1.162.70	10.1.162.71
10	10.1.162.72/29	10.1.162.73 – 10.1.162.78	10.1.162.79
11	10.1.162.80/29	10.1.162.81 – 10.1.162.86	10.1.162.87
12	10.1.162.88/29	10.1.162.89 – 10.1.162.94	10.1.162.95
13	10.1.162.96/29	10.1.162.97 – 10.1.162.102	10.1.162.103
14	10.1.162.104/29	10.1.162.105 – 10.1.162.110	10.1.162.111
15	10.1.162.112/29	10.1.162.113 – 10.1.162.118	10.1.162.119
16	10.1.162.120/29	10.1.162.121 – 10.1.162.126	10.1.162.127
17	10.1.162.128/29	10.1.162.129 – 10.1.162.134	10.1.162.135
18	10.1.162.136/29	10.1.162.137 – 10.1.162.142	10.1.162.143
19	10.1.162.144/29	10.1.162.145 – 10.1.162.150	10.1.162.151
20	10.1.162.152/29	10.1.162.153 – 10.1.162.158	10.1.162.159
21	10.1.162.160/29	10.1.162.161 – 10.1.162.166	10.1.162.167
22	10.1.162.168/29	10.1.162.169 – 10.1.162.174	10.1.162.175
23	10.1.162.176/29	10.1.162.177 – 10.1.162.182	10.1.162.183
24	10.1.162.184/29	10.1.162.185 – 10.1.162.190	10.1.162.191
25	10.1.162.192/29	10.1.162.193 – 10.1.162.198	10.1.162.199
26	10.1.162.200/29	10.1.162.201 – 10.1.162.206	10.1.162.207
27	10.1.162.208/29	10.1.162.209 – 10.1.162.214	10.1.162.215
28	10.1.162.216/29	10.1.162.217 – 10.1.162.222	10.1.162.223
29	10.1.162.224/29	10.1.162.225 – 10.1.162.230	10.1.162.231
30	10.1.162.232/29	10.1.162.233 – 10.1.162.238	10.1.162.239
31	10.1.162.240/29	10.1.162.241 – 10.1.162.246	10.1.162.247
32	10.1.162.248/29	10.1.162.249 – 10.1.162.254	10.1.162.255
33	10.1.163.0/29	10.1.163.1 – 10.1.163.6	10.1.163.7
34	10.1.163.8/29	10.1.163.9 – 10.1.163.14	10.1.163.15
35	10.1.163.16/29	10.1.163.17 – 10.1.163.22	10.1.163.23
36	10.1.163.24/29	10.1.163.25 – 10.1.163.30	10.1.163.31
37	10.1.163.32/29	10.1.163.33 – 10.1.163.38	10.1.163.39
38	10.1.163.40/29	10.1.163.41 – 10.1.163.46	10.1.163.47
39	10.1.163.48/29	10.1.163.49 – 10.1.163.54	10.1.163.55
40	10.1.163.56/29	10.1.163.57 – 10.1.163.62	10.1.163.63
41	10.1.163.64/29	10.1.163.65 – 10.1.163.70	10.1.163.71
42	10.1.163.72/29	10.1.163.73 – 10.1.163.78	10.1.163.79
43	10.1.163.80/29	10.1.163.81 – 10.1.163.86	10.1.163.87
44	10.1.163.88/29	10.1.163.89 – 10.1.163.94	10.1.163.95
45	10.1.163.96/29	10.1.163.97 – 10.1.163.102	10.1.163.103
46	10.1.163.104/29	10.1.163.105 – 10.1.163.110	10.1.163.111
47	10.1.163.112/29	10.1.163.113 – 10.1.163.118	10.1.163.119
48	10.1.163.120/29	10.1.163.121 – 10.1.163.126	10.1.163.127
49	10.1.163.128/29	10.1.163.129 – 10.1.163.134	10.1.163.135
50	10.1.163.136/29	10.1.163.137 – 10.1.163.142	10.1.163.143
51	10.1.163.144/29	10.1.163.145 – 10.1.163.150	10.1.163.151
52	10.1.163.152/29	10.1.163.153 – 10.1.163.158	10.1.163.159
53	10.1.163.160/29	10.1.163.161 – 10.1.163.166	10.1.163.167
54	10.1.163.168/29	10.1.163.169 – 10.1.163.174	10.1.163.175
55	10.1.163.176/29	10.1.163.177 – 10.1.163.182	10.1.163.183
56	10.1.163.184/29	10.1.163.185 – 10.1.163.190	10.1.163.191
57	10.1.163.192/29	10.1.163.193 – 10.1.163.198	10.1.163.199
58	10.1.163.200/29	10.1.163.201 – 10.1.163.206	10.1.163.207
59	10.1.163.208/29	10.1.163.209 – 10.1.163.214	10.1.163.215
60	10.1.163.216/29	10.1.163.217 – 10.1.163.222	10.1.163.223
61	10.1.163.224/29	10.1.163.225 – 10.1.163.230	10.1.163.231
62	10.1.163.232/29	10.1.163.233 – 10.1.163.238	10.1.163.239
63	10.1.163.240/29	10.1.163.241 – 10.1.163.246	10.1.163.247
64	10.1.163.248/29	10.1.163.249 – 10.1.163.254	10.1.163.255

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 →