ip
ipku.in

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.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.3.72.64/26
network10.3.72.64/26
broadcast10.3.72.127
first host10.3.72.65
last host10.3.72.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.72.64/26
address00001010.00000011.01001000.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.01001000.01000000
broadcast00001010.00000011.01001000.01111111
green = network part, grey = host part
hex0x0a034840
decimal167987264
reverse dns64.72.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4840

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.72.64/3210.3.72.64 – 10.3.72.6410.3.72.64
210.3.72.65/3210.3.72.65 – 10.3.72.6510.3.72.65
310.3.72.66/3210.3.72.66 – 10.3.72.6610.3.72.66
410.3.72.67/3210.3.72.67 – 10.3.72.6710.3.72.67
510.3.72.68/3210.3.72.68 – 10.3.72.6810.3.72.68
610.3.72.69/3210.3.72.69 – 10.3.72.6910.3.72.69
710.3.72.70/3210.3.72.70 – 10.3.72.7010.3.72.70
810.3.72.71/3210.3.72.71 – 10.3.72.7110.3.72.71
910.3.72.72/3210.3.72.72 – 10.3.72.7210.3.72.72
1010.3.72.73/3210.3.72.73 – 10.3.72.7310.3.72.73
1110.3.72.74/3210.3.72.74 – 10.3.72.7410.3.72.74
1210.3.72.75/3210.3.72.75 – 10.3.72.7510.3.72.75
1310.3.72.76/3210.3.72.76 – 10.3.72.7610.3.72.76
1410.3.72.77/3210.3.72.77 – 10.3.72.7710.3.72.77
1510.3.72.78/3210.3.72.78 – 10.3.72.7810.3.72.78
1610.3.72.79/3210.3.72.79 – 10.3.72.7910.3.72.79
1710.3.72.80/3210.3.72.80 – 10.3.72.8010.3.72.80
1810.3.72.81/3210.3.72.81 – 10.3.72.8110.3.72.81
1910.3.72.82/3210.3.72.82 – 10.3.72.8210.3.72.82
2010.3.72.83/3210.3.72.83 – 10.3.72.8310.3.72.83
2110.3.72.84/3210.3.72.84 – 10.3.72.8410.3.72.84
2210.3.72.85/3210.3.72.85 – 10.3.72.8510.3.72.85
2310.3.72.86/3210.3.72.86 – 10.3.72.8610.3.72.86
2410.3.72.87/3210.3.72.87 – 10.3.72.8710.3.72.87
2510.3.72.88/3210.3.72.88 – 10.3.72.8810.3.72.88
2610.3.72.89/3210.3.72.89 – 10.3.72.8910.3.72.89
2710.3.72.90/3210.3.72.90 – 10.3.72.9010.3.72.90
2810.3.72.91/3210.3.72.91 – 10.3.72.9110.3.72.91
2910.3.72.92/3210.3.72.92 – 10.3.72.9210.3.72.92
3010.3.72.93/3210.3.72.93 – 10.3.72.9310.3.72.93
3110.3.72.94/3210.3.72.94 – 10.3.72.9410.3.72.94
3210.3.72.95/3210.3.72.95 – 10.3.72.9510.3.72.95
3310.3.72.96/3210.3.72.96 – 10.3.72.9610.3.72.96
3410.3.72.97/3210.3.72.97 – 10.3.72.9710.3.72.97
3510.3.72.98/3210.3.72.98 – 10.3.72.9810.3.72.98
3610.3.72.99/3210.3.72.99 – 10.3.72.9910.3.72.99
3710.3.72.100/3210.3.72.100 – 10.3.72.10010.3.72.100
3810.3.72.101/3210.3.72.101 – 10.3.72.10110.3.72.101
3910.3.72.102/3210.3.72.102 – 10.3.72.10210.3.72.102
4010.3.72.103/3210.3.72.103 – 10.3.72.10310.3.72.103
4110.3.72.104/3210.3.72.104 – 10.3.72.10410.3.72.104
4210.3.72.105/3210.3.72.105 – 10.3.72.10510.3.72.105
4310.3.72.106/3210.3.72.106 – 10.3.72.10610.3.72.106
4410.3.72.107/3210.3.72.107 – 10.3.72.10710.3.72.107
4510.3.72.108/3210.3.72.108 – 10.3.72.10810.3.72.108
4610.3.72.109/3210.3.72.109 – 10.3.72.10910.3.72.109
4710.3.72.110/3210.3.72.110 – 10.3.72.11010.3.72.110
4810.3.72.111/3210.3.72.111 – 10.3.72.11110.3.72.111
4910.3.72.112/3210.3.72.112 – 10.3.72.11210.3.72.112
5010.3.72.113/3210.3.72.113 – 10.3.72.11310.3.72.113
5110.3.72.114/3210.3.72.114 – 10.3.72.11410.3.72.114
5210.3.72.115/3210.3.72.115 – 10.3.72.11510.3.72.115
5310.3.72.116/3210.3.72.116 – 10.3.72.11610.3.72.116
5410.3.72.117/3210.3.72.117 – 10.3.72.11710.3.72.117
5510.3.72.118/3210.3.72.118 – 10.3.72.11810.3.72.118
5610.3.72.119/3210.3.72.119 – 10.3.72.11910.3.72.119
5710.3.72.120/3210.3.72.120 – 10.3.72.12010.3.72.120
5810.3.72.121/3210.3.72.121 – 10.3.72.12110.3.72.121
5910.3.72.122/3210.3.72.122 – 10.3.72.12210.3.72.122
6010.3.72.123/3210.3.72.123 – 10.3.72.12310.3.72.123
6110.3.72.124/3210.3.72.124 – 10.3.72.12410.3.72.124
6210.3.72.125/3210.3.72.125 – 10.3.72.12510.3.72.125
6310.3.72.126/3210.3.72.126 – 10.3.72.12610.3.72.126
6410.3.72.127/3210.3.72.127 – 10.3.72.12710.3.72.127
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →