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)10.2.200.0/23

network10.2.200.0/23

broadcast10.2.201.255

first host10.2.200.1

last host10.2.201.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.200.0/23

address00001010.00000010.11001000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11001000.00000000

broadcast00001010.00000010.11001001.11111111

green = network part, grey = host part

hex0x0a02c800

decimal167954432

reverse dns0.200.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c800

/23 split into /28 · 32 subnets

close ×

#	network	host range	broadcast
1	10.2.200.0/28	10.2.200.1 – 10.2.200.14	10.2.200.15
2	10.2.200.16/28	10.2.200.17 – 10.2.200.30	10.2.200.31
3	10.2.200.32/28	10.2.200.33 – 10.2.200.46	10.2.200.47
4	10.2.200.48/28	10.2.200.49 – 10.2.200.62	10.2.200.63
5	10.2.200.64/28	10.2.200.65 – 10.2.200.78	10.2.200.79
6	10.2.200.80/28	10.2.200.81 – 10.2.200.94	10.2.200.95
7	10.2.200.96/28	10.2.200.97 – 10.2.200.110	10.2.200.111
8	10.2.200.112/28	10.2.200.113 – 10.2.200.126	10.2.200.127
9	10.2.200.128/28	10.2.200.129 – 10.2.200.142	10.2.200.143
10	10.2.200.144/28	10.2.200.145 – 10.2.200.158	10.2.200.159
11	10.2.200.160/28	10.2.200.161 – 10.2.200.174	10.2.200.175
12	10.2.200.176/28	10.2.200.177 – 10.2.200.190	10.2.200.191
13	10.2.200.192/28	10.2.200.193 – 10.2.200.206	10.2.200.207
14	10.2.200.208/28	10.2.200.209 – 10.2.200.222	10.2.200.223
15	10.2.200.224/28	10.2.200.225 – 10.2.200.238	10.2.200.239
16	10.2.200.240/28	10.2.200.241 – 10.2.200.254	10.2.200.255
17	10.2.201.0/28	10.2.201.1 – 10.2.201.14	10.2.201.15
18	10.2.201.16/28	10.2.201.17 – 10.2.201.30	10.2.201.31
19	10.2.201.32/28	10.2.201.33 – 10.2.201.46	10.2.201.47
20	10.2.201.48/28	10.2.201.49 – 10.2.201.62	10.2.201.63
21	10.2.201.64/28	10.2.201.65 – 10.2.201.78	10.2.201.79
22	10.2.201.80/28	10.2.201.81 – 10.2.201.94	10.2.201.95
23	10.2.201.96/28	10.2.201.97 – 10.2.201.110	10.2.201.111
24	10.2.201.112/28	10.2.201.113 – 10.2.201.126	10.2.201.127
25	10.2.201.128/28	10.2.201.129 – 10.2.201.142	10.2.201.143
26	10.2.201.144/28	10.2.201.145 – 10.2.201.158	10.2.201.159
27	10.2.201.160/28	10.2.201.161 – 10.2.201.174	10.2.201.175
28	10.2.201.176/28	10.2.201.177 – 10.2.201.190	10.2.201.191
29	10.2.201.192/28	10.2.201.193 – 10.2.201.206	10.2.201.207
30	10.2.201.208/28	10.2.201.209 – 10.2.201.222	10.2.201.223
31	10.2.201.224/28	10.2.201.225 – 10.2.201.238	10.2.201.239
32	10.2.201.240/28	10.2.201.241 – 10.2.201.254	10.2.201.255

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 →