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)10.0.118.0/23

network10.0.118.0/23

broadcast10.0.119.255

first host10.0.118.1

last host10.0.119.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.118.0/23

address00001010.00000000.01110110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.01110110.00000000

broadcast00001010.00000000.01110111.11111111

green = network part, grey = host part

hex0x0a007600

decimal167802368

reverse dns0.118.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7600

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.118.0/29	10.0.118.1 – 10.0.118.6	10.0.118.7
2	10.0.118.8/29	10.0.118.9 – 10.0.118.14	10.0.118.15
3	10.0.118.16/29	10.0.118.17 – 10.0.118.22	10.0.118.23
4	10.0.118.24/29	10.0.118.25 – 10.0.118.30	10.0.118.31
5	10.0.118.32/29	10.0.118.33 – 10.0.118.38	10.0.118.39
6	10.0.118.40/29	10.0.118.41 – 10.0.118.46	10.0.118.47
7	10.0.118.48/29	10.0.118.49 – 10.0.118.54	10.0.118.55
8	10.0.118.56/29	10.0.118.57 – 10.0.118.62	10.0.118.63
9	10.0.118.64/29	10.0.118.65 – 10.0.118.70	10.0.118.71
10	10.0.118.72/29	10.0.118.73 – 10.0.118.78	10.0.118.79
11	10.0.118.80/29	10.0.118.81 – 10.0.118.86	10.0.118.87
12	10.0.118.88/29	10.0.118.89 – 10.0.118.94	10.0.118.95
13	10.0.118.96/29	10.0.118.97 – 10.0.118.102	10.0.118.103
14	10.0.118.104/29	10.0.118.105 – 10.0.118.110	10.0.118.111
15	10.0.118.112/29	10.0.118.113 – 10.0.118.118	10.0.118.119
16	10.0.118.120/29	10.0.118.121 – 10.0.118.126	10.0.118.127
17	10.0.118.128/29	10.0.118.129 – 10.0.118.134	10.0.118.135
18	10.0.118.136/29	10.0.118.137 – 10.0.118.142	10.0.118.143
19	10.0.118.144/29	10.0.118.145 – 10.0.118.150	10.0.118.151
20	10.0.118.152/29	10.0.118.153 – 10.0.118.158	10.0.118.159
21	10.0.118.160/29	10.0.118.161 – 10.0.118.166	10.0.118.167
22	10.0.118.168/29	10.0.118.169 – 10.0.118.174	10.0.118.175
23	10.0.118.176/29	10.0.118.177 – 10.0.118.182	10.0.118.183
24	10.0.118.184/29	10.0.118.185 – 10.0.118.190	10.0.118.191
25	10.0.118.192/29	10.0.118.193 – 10.0.118.198	10.0.118.199
26	10.0.118.200/29	10.0.118.201 – 10.0.118.206	10.0.118.207
27	10.0.118.208/29	10.0.118.209 – 10.0.118.214	10.0.118.215
28	10.0.118.216/29	10.0.118.217 – 10.0.118.222	10.0.118.223
29	10.0.118.224/29	10.0.118.225 – 10.0.118.230	10.0.118.231
30	10.0.118.232/29	10.0.118.233 – 10.0.118.238	10.0.118.239
31	10.0.118.240/29	10.0.118.241 – 10.0.118.246	10.0.118.247
32	10.0.118.248/29	10.0.118.249 – 10.0.118.254	10.0.118.255
33	10.0.119.0/29	10.0.119.1 – 10.0.119.6	10.0.119.7
34	10.0.119.8/29	10.0.119.9 – 10.0.119.14	10.0.119.15
35	10.0.119.16/29	10.0.119.17 – 10.0.119.22	10.0.119.23
36	10.0.119.24/29	10.0.119.25 – 10.0.119.30	10.0.119.31
37	10.0.119.32/29	10.0.119.33 – 10.0.119.38	10.0.119.39
38	10.0.119.40/29	10.0.119.41 – 10.0.119.46	10.0.119.47
39	10.0.119.48/29	10.0.119.49 – 10.0.119.54	10.0.119.55
40	10.0.119.56/29	10.0.119.57 – 10.0.119.62	10.0.119.63
41	10.0.119.64/29	10.0.119.65 – 10.0.119.70	10.0.119.71
42	10.0.119.72/29	10.0.119.73 – 10.0.119.78	10.0.119.79
43	10.0.119.80/29	10.0.119.81 – 10.0.119.86	10.0.119.87
44	10.0.119.88/29	10.0.119.89 – 10.0.119.94	10.0.119.95
45	10.0.119.96/29	10.0.119.97 – 10.0.119.102	10.0.119.103
46	10.0.119.104/29	10.0.119.105 – 10.0.119.110	10.0.119.111
47	10.0.119.112/29	10.0.119.113 – 10.0.119.118	10.0.119.119
48	10.0.119.120/29	10.0.119.121 – 10.0.119.126	10.0.119.127
49	10.0.119.128/29	10.0.119.129 – 10.0.119.134	10.0.119.135
50	10.0.119.136/29	10.0.119.137 – 10.0.119.142	10.0.119.143
51	10.0.119.144/29	10.0.119.145 – 10.0.119.150	10.0.119.151
52	10.0.119.152/29	10.0.119.153 – 10.0.119.158	10.0.119.159
53	10.0.119.160/29	10.0.119.161 – 10.0.119.166	10.0.119.167
54	10.0.119.168/29	10.0.119.169 – 10.0.119.174	10.0.119.175
55	10.0.119.176/29	10.0.119.177 – 10.0.119.182	10.0.119.183
56	10.0.119.184/29	10.0.119.185 – 10.0.119.190	10.0.119.191
57	10.0.119.192/29	10.0.119.193 – 10.0.119.198	10.0.119.199
58	10.0.119.200/29	10.0.119.201 – 10.0.119.206	10.0.119.207
59	10.0.119.208/29	10.0.119.209 – 10.0.119.214	10.0.119.215
60	10.0.119.216/29	10.0.119.217 – 10.0.119.222	10.0.119.223
61	10.0.119.224/29	10.0.119.225 – 10.0.119.230	10.0.119.231
62	10.0.119.232/29	10.0.119.233 – 10.0.119.238	10.0.119.239
63	10.0.119.240/29	10.0.119.241 – 10.0.119.246	10.0.119.247
64	10.0.119.248/29	10.0.119.249 – 10.0.119.254	10.0.119.255

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 →