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)172.16.5.96/27

network172.16.5.96/27

broadcast172.16.5.127

first host172.16.5.97

last host172.16.5.126

subnet mask255.255.255.224

wildcard0.0.0.31

addresses32

usable hosts30

classB

ipcalc 172.16.5.96/27

address10101100.00010000.00000101.01100000

subnet mask11111111.11111111.11111111.11100000

network10101100.00010000.00000101.01100000

broadcast10101100.00010000.00000101.01111111

green = network part, grey = host part

hex0xac100560

decimal2886731104

reverse dns96.5.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:560

/27 split into /32 · 32 subnets

close ×

#	network	host range	broadcast
1	172.16.5.96/32	172.16.5.96 – 172.16.5.96	172.16.5.96
2	172.16.5.97/32	172.16.5.97 – 172.16.5.97	172.16.5.97
3	172.16.5.98/32	172.16.5.98 – 172.16.5.98	172.16.5.98
4	172.16.5.99/32	172.16.5.99 – 172.16.5.99	172.16.5.99
5	172.16.5.100/32	172.16.5.100 – 172.16.5.100	172.16.5.100
6	172.16.5.101/32	172.16.5.101 – 172.16.5.101	172.16.5.101
7	172.16.5.102/32	172.16.5.102 – 172.16.5.102	172.16.5.102
8	172.16.5.103/32	172.16.5.103 – 172.16.5.103	172.16.5.103
9	172.16.5.104/32	172.16.5.104 – 172.16.5.104	172.16.5.104
10	172.16.5.105/32	172.16.5.105 – 172.16.5.105	172.16.5.105
11	172.16.5.106/32	172.16.5.106 – 172.16.5.106	172.16.5.106
12	172.16.5.107/32	172.16.5.107 – 172.16.5.107	172.16.5.107
13	172.16.5.108/32	172.16.5.108 – 172.16.5.108	172.16.5.108
14	172.16.5.109/32	172.16.5.109 – 172.16.5.109	172.16.5.109
15	172.16.5.110/32	172.16.5.110 – 172.16.5.110	172.16.5.110
16	172.16.5.111/32	172.16.5.111 – 172.16.5.111	172.16.5.111
17	172.16.5.112/32	172.16.5.112 – 172.16.5.112	172.16.5.112
18	172.16.5.113/32	172.16.5.113 – 172.16.5.113	172.16.5.113
19	172.16.5.114/32	172.16.5.114 – 172.16.5.114	172.16.5.114
20	172.16.5.115/32	172.16.5.115 – 172.16.5.115	172.16.5.115
21	172.16.5.116/32	172.16.5.116 – 172.16.5.116	172.16.5.116
22	172.16.5.117/32	172.16.5.117 – 172.16.5.117	172.16.5.117
23	172.16.5.118/32	172.16.5.118 – 172.16.5.118	172.16.5.118
24	172.16.5.119/32	172.16.5.119 – 172.16.5.119	172.16.5.119
25	172.16.5.120/32	172.16.5.120 – 172.16.5.120	172.16.5.120
26	172.16.5.121/32	172.16.5.121 – 172.16.5.121	172.16.5.121
27	172.16.5.122/32	172.16.5.122 – 172.16.5.122	172.16.5.122
28	172.16.5.123/32	172.16.5.123 – 172.16.5.123	172.16.5.123
29	172.16.5.124/32	172.16.5.124 – 172.16.5.124	172.16.5.124
30	172.16.5.125/32	172.16.5.125 – 172.16.5.125	172.16.5.125
31	172.16.5.126/32	172.16.5.126 – 172.16.5.126	172.16.5.126
32	172.16.5.127/32	172.16.5.127 – 172.16.5.127	172.16.5.127

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 →