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)10.2.110.0/23

network10.2.110.0/23

broadcast10.2.111.255

first host10.2.110.1

last host10.2.111.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.110.0/23

address00001010.00000010.01101110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01101110.00000000

broadcast00001010.00000010.01101111.11111111

green = network part, grey = host part

hex0x0a026e00

decimal167931392

reverse dns0.110.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:6e00

/23 split into /28 · 32 subnets

close ×

#	network	host range	broadcast
1	10.2.110.0/28	10.2.110.1 – 10.2.110.14	10.2.110.15
2	10.2.110.16/28	10.2.110.17 – 10.2.110.30	10.2.110.31
3	10.2.110.32/28	10.2.110.33 – 10.2.110.46	10.2.110.47
4	10.2.110.48/28	10.2.110.49 – 10.2.110.62	10.2.110.63
5	10.2.110.64/28	10.2.110.65 – 10.2.110.78	10.2.110.79
6	10.2.110.80/28	10.2.110.81 – 10.2.110.94	10.2.110.95
7	10.2.110.96/28	10.2.110.97 – 10.2.110.110	10.2.110.111
8	10.2.110.112/28	10.2.110.113 – 10.2.110.126	10.2.110.127
9	10.2.110.128/28	10.2.110.129 – 10.2.110.142	10.2.110.143
10	10.2.110.144/28	10.2.110.145 – 10.2.110.158	10.2.110.159
11	10.2.110.160/28	10.2.110.161 – 10.2.110.174	10.2.110.175
12	10.2.110.176/28	10.2.110.177 – 10.2.110.190	10.2.110.191
13	10.2.110.192/28	10.2.110.193 – 10.2.110.206	10.2.110.207
14	10.2.110.208/28	10.2.110.209 – 10.2.110.222	10.2.110.223
15	10.2.110.224/28	10.2.110.225 – 10.2.110.238	10.2.110.239
16	10.2.110.240/28	10.2.110.241 – 10.2.110.254	10.2.110.255
17	10.2.111.0/28	10.2.111.1 – 10.2.111.14	10.2.111.15
18	10.2.111.16/28	10.2.111.17 – 10.2.111.30	10.2.111.31
19	10.2.111.32/28	10.2.111.33 – 10.2.111.46	10.2.111.47
20	10.2.111.48/28	10.2.111.49 – 10.2.111.62	10.2.111.63
21	10.2.111.64/28	10.2.111.65 – 10.2.111.78	10.2.111.79
22	10.2.111.80/28	10.2.111.81 – 10.2.111.94	10.2.111.95
23	10.2.111.96/28	10.2.111.97 – 10.2.111.110	10.2.111.111
24	10.2.111.112/28	10.2.111.113 – 10.2.111.126	10.2.111.127
25	10.2.111.128/28	10.2.111.129 – 10.2.111.142	10.2.111.143
26	10.2.111.144/28	10.2.111.145 – 10.2.111.158	10.2.111.159
27	10.2.111.160/28	10.2.111.161 – 10.2.111.174	10.2.111.175
28	10.2.111.176/28	10.2.111.177 – 10.2.111.190	10.2.111.191
29	10.2.111.192/28	10.2.111.193 – 10.2.111.206	10.2.111.207
30	10.2.111.208/28	10.2.111.209 – 10.2.111.222	10.2.111.223
31	10.2.111.224/28	10.2.111.225 – 10.2.111.238	10.2.111.239
32	10.2.111.240/28	10.2.111.241 – 10.2.111.254	10.2.111.255

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 →