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)10.0.139.0/24

network10.0.139.0/24

broadcast10.0.139.255

first host10.0.139.1

last host10.0.139.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.139.0/24

address00001010.00000000.10001011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10001011.00000000

broadcast00001010.00000000.10001011.11111111

green = network part, grey = host part

hex0x0a008b00

decimal167807744

reverse dns0.139.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:8b00

/24 split into /29 · 32 subnets

close ×

#	network	host range	broadcast
1	10.0.139.0/29	10.0.139.1 – 10.0.139.6	10.0.139.7
2	10.0.139.8/29	10.0.139.9 – 10.0.139.14	10.0.139.15
3	10.0.139.16/29	10.0.139.17 – 10.0.139.22	10.0.139.23
4	10.0.139.24/29	10.0.139.25 – 10.0.139.30	10.0.139.31
5	10.0.139.32/29	10.0.139.33 – 10.0.139.38	10.0.139.39
6	10.0.139.40/29	10.0.139.41 – 10.0.139.46	10.0.139.47
7	10.0.139.48/29	10.0.139.49 – 10.0.139.54	10.0.139.55
8	10.0.139.56/29	10.0.139.57 – 10.0.139.62	10.0.139.63
9	10.0.139.64/29	10.0.139.65 – 10.0.139.70	10.0.139.71
10	10.0.139.72/29	10.0.139.73 – 10.0.139.78	10.0.139.79
11	10.0.139.80/29	10.0.139.81 – 10.0.139.86	10.0.139.87
12	10.0.139.88/29	10.0.139.89 – 10.0.139.94	10.0.139.95
13	10.0.139.96/29	10.0.139.97 – 10.0.139.102	10.0.139.103
14	10.0.139.104/29	10.0.139.105 – 10.0.139.110	10.0.139.111
15	10.0.139.112/29	10.0.139.113 – 10.0.139.118	10.0.139.119
16	10.0.139.120/29	10.0.139.121 – 10.0.139.126	10.0.139.127
17	10.0.139.128/29	10.0.139.129 – 10.0.139.134	10.0.139.135
18	10.0.139.136/29	10.0.139.137 – 10.0.139.142	10.0.139.143
19	10.0.139.144/29	10.0.139.145 – 10.0.139.150	10.0.139.151
20	10.0.139.152/29	10.0.139.153 – 10.0.139.158	10.0.139.159
21	10.0.139.160/29	10.0.139.161 – 10.0.139.166	10.0.139.167
22	10.0.139.168/29	10.0.139.169 – 10.0.139.174	10.0.139.175
23	10.0.139.176/29	10.0.139.177 – 10.0.139.182	10.0.139.183
24	10.0.139.184/29	10.0.139.185 – 10.0.139.190	10.0.139.191
25	10.0.139.192/29	10.0.139.193 – 10.0.139.198	10.0.139.199
26	10.0.139.200/29	10.0.139.201 – 10.0.139.206	10.0.139.207
27	10.0.139.208/29	10.0.139.209 – 10.0.139.214	10.0.139.215
28	10.0.139.216/29	10.0.139.217 – 10.0.139.222	10.0.139.223
29	10.0.139.224/29	10.0.139.225 – 10.0.139.230	10.0.139.231
30	10.0.139.232/29	10.0.139.233 – 10.0.139.238	10.0.139.239
31	10.0.139.240/29	10.0.139.241 – 10.0.139.246	10.0.139.247
32	10.0.139.248/29	10.0.139.249 – 10.0.139.254	10.0.139.255

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