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)10.2.243.64/26

network10.2.243.64/26

broadcast10.2.243.127

first host10.2.243.65

last host10.2.243.126

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.243.64/26

address00001010.00000010.11110011.01000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.11110011.01000000

broadcast00001010.00000010.11110011.01111111

green = network part, grey = host part

hex0x0a02f340

decimal167965504

reverse dns64.243.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f340

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	10.2.243.64/31	10.2.243.64 – 10.2.243.65	10.2.243.65
2	10.2.243.66/31	10.2.243.66 – 10.2.243.67	10.2.243.67
3	10.2.243.68/31	10.2.243.68 – 10.2.243.69	10.2.243.69
4	10.2.243.70/31	10.2.243.70 – 10.2.243.71	10.2.243.71
5	10.2.243.72/31	10.2.243.72 – 10.2.243.73	10.2.243.73
6	10.2.243.74/31	10.2.243.74 – 10.2.243.75	10.2.243.75
7	10.2.243.76/31	10.2.243.76 – 10.2.243.77	10.2.243.77
8	10.2.243.78/31	10.2.243.78 – 10.2.243.79	10.2.243.79
9	10.2.243.80/31	10.2.243.80 – 10.2.243.81	10.2.243.81
10	10.2.243.82/31	10.2.243.82 – 10.2.243.83	10.2.243.83
11	10.2.243.84/31	10.2.243.84 – 10.2.243.85	10.2.243.85
12	10.2.243.86/31	10.2.243.86 – 10.2.243.87	10.2.243.87
13	10.2.243.88/31	10.2.243.88 – 10.2.243.89	10.2.243.89
14	10.2.243.90/31	10.2.243.90 – 10.2.243.91	10.2.243.91
15	10.2.243.92/31	10.2.243.92 – 10.2.243.93	10.2.243.93
16	10.2.243.94/31	10.2.243.94 – 10.2.243.95	10.2.243.95
17	10.2.243.96/31	10.2.243.96 – 10.2.243.97	10.2.243.97
18	10.2.243.98/31	10.2.243.98 – 10.2.243.99	10.2.243.99
19	10.2.243.100/31	10.2.243.100 – 10.2.243.101	10.2.243.101
20	10.2.243.102/31	10.2.243.102 – 10.2.243.103	10.2.243.103
21	10.2.243.104/31	10.2.243.104 – 10.2.243.105	10.2.243.105
22	10.2.243.106/31	10.2.243.106 – 10.2.243.107	10.2.243.107
23	10.2.243.108/31	10.2.243.108 – 10.2.243.109	10.2.243.109
24	10.2.243.110/31	10.2.243.110 – 10.2.243.111	10.2.243.111
25	10.2.243.112/31	10.2.243.112 – 10.2.243.113	10.2.243.113
26	10.2.243.114/31	10.2.243.114 – 10.2.243.115	10.2.243.115
27	10.2.243.116/31	10.2.243.116 – 10.2.243.117	10.2.243.117
28	10.2.243.118/31	10.2.243.118 – 10.2.243.119	10.2.243.119
29	10.2.243.120/31	10.2.243.120 – 10.2.243.121	10.2.243.121
30	10.2.243.122/31	10.2.243.122 – 10.2.243.123	10.2.243.123
31	10.2.243.124/31	10.2.243.124 – 10.2.243.125	10.2.243.125
32	10.2.243.126/31	10.2.243.126 – 10.2.243.127	10.2.243.127

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 /26
/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	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 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 →