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)10.167.28.224/27

network10.167.28.224/27

broadcast10.167.28.255

first host10.167.28.225

last host10.167.28.254

subnet mask255.255.255.224

wildcard0.0.0.31

addresses32

usable hosts30

classA

ipcalc 10.167.28.224/27

address00001010.10100111.00011100.11100000

subnet mask11111111.11111111.11111111.11100000

network00001010.10100111.00011100.11100000

broadcast00001010.10100111.00011100.11111111

green = network part, grey = host part

hex0x0aa71ce0

decimal178724064

reverse dns224.28.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:1ce0

/27 split into /32 · 32 subnets

close ×

#	network	host range	broadcast
1	10.167.28.224/32	10.167.28.224 – 10.167.28.224	10.167.28.224
2	10.167.28.225/32	10.167.28.225 – 10.167.28.225	10.167.28.225
3	10.167.28.226/32	10.167.28.226 – 10.167.28.226	10.167.28.226
4	10.167.28.227/32	10.167.28.227 – 10.167.28.227	10.167.28.227
5	10.167.28.228/32	10.167.28.228 – 10.167.28.228	10.167.28.228
6	10.167.28.229/32	10.167.28.229 – 10.167.28.229	10.167.28.229
7	10.167.28.230/32	10.167.28.230 – 10.167.28.230	10.167.28.230
8	10.167.28.231/32	10.167.28.231 – 10.167.28.231	10.167.28.231
9	10.167.28.232/32	10.167.28.232 – 10.167.28.232	10.167.28.232
10	10.167.28.233/32	10.167.28.233 – 10.167.28.233	10.167.28.233
11	10.167.28.234/32	10.167.28.234 – 10.167.28.234	10.167.28.234
12	10.167.28.235/32	10.167.28.235 – 10.167.28.235	10.167.28.235
13	10.167.28.236/32	10.167.28.236 – 10.167.28.236	10.167.28.236
14	10.167.28.237/32	10.167.28.237 – 10.167.28.237	10.167.28.237
15	10.167.28.238/32	10.167.28.238 – 10.167.28.238	10.167.28.238
16	10.167.28.239/32	10.167.28.239 – 10.167.28.239	10.167.28.239
17	10.167.28.240/32	10.167.28.240 – 10.167.28.240	10.167.28.240
18	10.167.28.241/32	10.167.28.241 – 10.167.28.241	10.167.28.241
19	10.167.28.242/32	10.167.28.242 – 10.167.28.242	10.167.28.242
20	10.167.28.243/32	10.167.28.243 – 10.167.28.243	10.167.28.243
21	10.167.28.244/32	10.167.28.244 – 10.167.28.244	10.167.28.244
22	10.167.28.245/32	10.167.28.245 – 10.167.28.245	10.167.28.245
23	10.167.28.246/32	10.167.28.246 – 10.167.28.246	10.167.28.246
24	10.167.28.247/32	10.167.28.247 – 10.167.28.247	10.167.28.247
25	10.167.28.248/32	10.167.28.248 – 10.167.28.248	10.167.28.248
26	10.167.28.249/32	10.167.28.249 – 10.167.28.249	10.167.28.249
27	10.167.28.250/32	10.167.28.250 – 10.167.28.250	10.167.28.250
28	10.167.28.251/32	10.167.28.251 – 10.167.28.251	10.167.28.251
29	10.167.28.252/32	10.167.28.252 – 10.167.28.252	10.167.28.252
30	10.167.28.253/32	10.167.28.253 – 10.167.28.253	10.167.28.253
31	10.167.28.254/32	10.167.28.254 – 10.167.28.254	10.167.28.254
32	10.167.28.255/32	10.167.28.255 – 10.167.28.255	10.167.28.255

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 /27
/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	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	-
/26	255.255.255.192	64	62	-
/27	255.255.255.224	32	30	1
/28	255.255.255.240	16	14	2 split →
/29	255.255.255.248	8	6	4 split →
/30	255.255.255.252	4	2	8 split →
/31	255.255.255.254	2	2	16 split →
/32	255.255.255.255	1	1	32 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 →