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)10.0.122.0/23

network10.0.122.0/23

broadcast10.0.123.255

first host10.0.122.1

last host10.0.123.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.122.0/23

address00001010.00000000.01111010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.01111010.00000000

broadcast00001010.00000000.01111011.11111111

green = network part, grey = host part

hex0x0a007a00

decimal167803392

reverse dns0.122.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7a00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.122.0/29	10.0.122.1 – 10.0.122.6	10.0.122.7
2	10.0.122.8/29	10.0.122.9 – 10.0.122.14	10.0.122.15
3	10.0.122.16/29	10.0.122.17 – 10.0.122.22	10.0.122.23
4	10.0.122.24/29	10.0.122.25 – 10.0.122.30	10.0.122.31
5	10.0.122.32/29	10.0.122.33 – 10.0.122.38	10.0.122.39
6	10.0.122.40/29	10.0.122.41 – 10.0.122.46	10.0.122.47
7	10.0.122.48/29	10.0.122.49 – 10.0.122.54	10.0.122.55
8	10.0.122.56/29	10.0.122.57 – 10.0.122.62	10.0.122.63
9	10.0.122.64/29	10.0.122.65 – 10.0.122.70	10.0.122.71
10	10.0.122.72/29	10.0.122.73 – 10.0.122.78	10.0.122.79
11	10.0.122.80/29	10.0.122.81 – 10.0.122.86	10.0.122.87
12	10.0.122.88/29	10.0.122.89 – 10.0.122.94	10.0.122.95
13	10.0.122.96/29	10.0.122.97 – 10.0.122.102	10.0.122.103
14	10.0.122.104/29	10.0.122.105 – 10.0.122.110	10.0.122.111
15	10.0.122.112/29	10.0.122.113 – 10.0.122.118	10.0.122.119
16	10.0.122.120/29	10.0.122.121 – 10.0.122.126	10.0.122.127
17	10.0.122.128/29	10.0.122.129 – 10.0.122.134	10.0.122.135
18	10.0.122.136/29	10.0.122.137 – 10.0.122.142	10.0.122.143
19	10.0.122.144/29	10.0.122.145 – 10.0.122.150	10.0.122.151
20	10.0.122.152/29	10.0.122.153 – 10.0.122.158	10.0.122.159
21	10.0.122.160/29	10.0.122.161 – 10.0.122.166	10.0.122.167
22	10.0.122.168/29	10.0.122.169 – 10.0.122.174	10.0.122.175
23	10.0.122.176/29	10.0.122.177 – 10.0.122.182	10.0.122.183
24	10.0.122.184/29	10.0.122.185 – 10.0.122.190	10.0.122.191
25	10.0.122.192/29	10.0.122.193 – 10.0.122.198	10.0.122.199
26	10.0.122.200/29	10.0.122.201 – 10.0.122.206	10.0.122.207
27	10.0.122.208/29	10.0.122.209 – 10.0.122.214	10.0.122.215
28	10.0.122.216/29	10.0.122.217 – 10.0.122.222	10.0.122.223
29	10.0.122.224/29	10.0.122.225 – 10.0.122.230	10.0.122.231
30	10.0.122.232/29	10.0.122.233 – 10.0.122.238	10.0.122.239
31	10.0.122.240/29	10.0.122.241 – 10.0.122.246	10.0.122.247
32	10.0.122.248/29	10.0.122.249 – 10.0.122.254	10.0.122.255
33	10.0.123.0/29	10.0.123.1 – 10.0.123.6	10.0.123.7
34	10.0.123.8/29	10.0.123.9 – 10.0.123.14	10.0.123.15
35	10.0.123.16/29	10.0.123.17 – 10.0.123.22	10.0.123.23
36	10.0.123.24/29	10.0.123.25 – 10.0.123.30	10.0.123.31
37	10.0.123.32/29	10.0.123.33 – 10.0.123.38	10.0.123.39
38	10.0.123.40/29	10.0.123.41 – 10.0.123.46	10.0.123.47
39	10.0.123.48/29	10.0.123.49 – 10.0.123.54	10.0.123.55
40	10.0.123.56/29	10.0.123.57 – 10.0.123.62	10.0.123.63
41	10.0.123.64/29	10.0.123.65 – 10.0.123.70	10.0.123.71
42	10.0.123.72/29	10.0.123.73 – 10.0.123.78	10.0.123.79
43	10.0.123.80/29	10.0.123.81 – 10.0.123.86	10.0.123.87
44	10.0.123.88/29	10.0.123.89 – 10.0.123.94	10.0.123.95
45	10.0.123.96/29	10.0.123.97 – 10.0.123.102	10.0.123.103
46	10.0.123.104/29	10.0.123.105 – 10.0.123.110	10.0.123.111
47	10.0.123.112/29	10.0.123.113 – 10.0.123.118	10.0.123.119
48	10.0.123.120/29	10.0.123.121 – 10.0.123.126	10.0.123.127
49	10.0.123.128/29	10.0.123.129 – 10.0.123.134	10.0.123.135
50	10.0.123.136/29	10.0.123.137 – 10.0.123.142	10.0.123.143
51	10.0.123.144/29	10.0.123.145 – 10.0.123.150	10.0.123.151
52	10.0.123.152/29	10.0.123.153 – 10.0.123.158	10.0.123.159
53	10.0.123.160/29	10.0.123.161 – 10.0.123.166	10.0.123.167
54	10.0.123.168/29	10.0.123.169 – 10.0.123.174	10.0.123.175
55	10.0.123.176/29	10.0.123.177 – 10.0.123.182	10.0.123.183
56	10.0.123.184/29	10.0.123.185 – 10.0.123.190	10.0.123.191
57	10.0.123.192/29	10.0.123.193 – 10.0.123.198	10.0.123.199
58	10.0.123.200/29	10.0.123.201 – 10.0.123.206	10.0.123.207
59	10.0.123.208/29	10.0.123.209 – 10.0.123.214	10.0.123.215
60	10.0.123.216/29	10.0.123.217 – 10.0.123.222	10.0.123.223
61	10.0.123.224/29	10.0.123.225 – 10.0.123.230	10.0.123.231
62	10.0.123.232/29	10.0.123.233 – 10.0.123.238	10.0.123.239
63	10.0.123.240/29	10.0.123.241 – 10.0.123.246	10.0.123.247
64	10.0.123.248/29	10.0.123.249 – 10.0.123.254	10.0.123.255

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 →