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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)10.20.3.64/26
network10.20.3.64/26
broadcast10.20.3.127
first host10.20.3.65
last host10.20.3.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.20.3.64/26
address00001010.00010100.00000011.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00010100.00000011.01000000
broadcast00001010.00010100.00000011.01111111
green = network part, grey = host part
hex0x0a140340
decimal169083712
reverse dns64.3.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:340

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.20.3.64/3210.20.3.64 – 10.20.3.6410.20.3.64
210.20.3.65/3210.20.3.65 – 10.20.3.6510.20.3.65
310.20.3.66/3210.20.3.66 – 10.20.3.6610.20.3.66
410.20.3.67/3210.20.3.67 – 10.20.3.6710.20.3.67
510.20.3.68/3210.20.3.68 – 10.20.3.6810.20.3.68
610.20.3.69/3210.20.3.69 – 10.20.3.6910.20.3.69
710.20.3.70/3210.20.3.70 – 10.20.3.7010.20.3.70
810.20.3.71/3210.20.3.71 – 10.20.3.7110.20.3.71
910.20.3.72/3210.20.3.72 – 10.20.3.7210.20.3.72
1010.20.3.73/3210.20.3.73 – 10.20.3.7310.20.3.73
1110.20.3.74/3210.20.3.74 – 10.20.3.7410.20.3.74
1210.20.3.75/3210.20.3.75 – 10.20.3.7510.20.3.75
1310.20.3.76/3210.20.3.76 – 10.20.3.7610.20.3.76
1410.20.3.77/3210.20.3.77 – 10.20.3.7710.20.3.77
1510.20.3.78/3210.20.3.78 – 10.20.3.7810.20.3.78
1610.20.3.79/3210.20.3.79 – 10.20.3.7910.20.3.79
1710.20.3.80/3210.20.3.80 – 10.20.3.8010.20.3.80
1810.20.3.81/3210.20.3.81 – 10.20.3.8110.20.3.81
1910.20.3.82/3210.20.3.82 – 10.20.3.8210.20.3.82
2010.20.3.83/3210.20.3.83 – 10.20.3.8310.20.3.83
2110.20.3.84/3210.20.3.84 – 10.20.3.8410.20.3.84
2210.20.3.85/3210.20.3.85 – 10.20.3.8510.20.3.85
2310.20.3.86/3210.20.3.86 – 10.20.3.8610.20.3.86
2410.20.3.87/3210.20.3.87 – 10.20.3.8710.20.3.87
2510.20.3.88/3210.20.3.88 – 10.20.3.8810.20.3.88
2610.20.3.89/3210.20.3.89 – 10.20.3.8910.20.3.89
2710.20.3.90/3210.20.3.90 – 10.20.3.9010.20.3.90
2810.20.3.91/3210.20.3.91 – 10.20.3.9110.20.3.91
2910.20.3.92/3210.20.3.92 – 10.20.3.9210.20.3.92
3010.20.3.93/3210.20.3.93 – 10.20.3.9310.20.3.93
3110.20.3.94/3210.20.3.94 – 10.20.3.9410.20.3.94
3210.20.3.95/3210.20.3.95 – 10.20.3.9510.20.3.95
3310.20.3.96/3210.20.3.96 – 10.20.3.9610.20.3.96
3410.20.3.97/3210.20.3.97 – 10.20.3.9710.20.3.97
3510.20.3.98/3210.20.3.98 – 10.20.3.9810.20.3.98
3610.20.3.99/3210.20.3.99 – 10.20.3.9910.20.3.99
3710.20.3.100/3210.20.3.100 – 10.20.3.10010.20.3.100
3810.20.3.101/3210.20.3.101 – 10.20.3.10110.20.3.101
3910.20.3.102/3210.20.3.102 – 10.20.3.10210.20.3.102
4010.20.3.103/3210.20.3.103 – 10.20.3.10310.20.3.103
4110.20.3.104/3210.20.3.104 – 10.20.3.10410.20.3.104
4210.20.3.105/3210.20.3.105 – 10.20.3.10510.20.3.105
4310.20.3.106/3210.20.3.106 – 10.20.3.10610.20.3.106
4410.20.3.107/3210.20.3.107 – 10.20.3.10710.20.3.107
4510.20.3.108/3210.20.3.108 – 10.20.3.10810.20.3.108
4610.20.3.109/3210.20.3.109 – 10.20.3.10910.20.3.109
4710.20.3.110/3210.20.3.110 – 10.20.3.11010.20.3.110
4810.20.3.111/3210.20.3.111 – 10.20.3.11110.20.3.111
4910.20.3.112/3210.20.3.112 – 10.20.3.11210.20.3.112
5010.20.3.113/3210.20.3.113 – 10.20.3.11310.20.3.113
5110.20.3.114/3210.20.3.114 – 10.20.3.11410.20.3.114
5210.20.3.115/3210.20.3.115 – 10.20.3.11510.20.3.115
5310.20.3.116/3210.20.3.116 – 10.20.3.11610.20.3.116
5410.20.3.117/3210.20.3.117 – 10.20.3.11710.20.3.117
5510.20.3.118/3210.20.3.118 – 10.20.3.11810.20.3.118
5610.20.3.119/3210.20.3.119 – 10.20.3.11910.20.3.119
5710.20.3.120/3210.20.3.120 – 10.20.3.12010.20.3.120
5810.20.3.121/3210.20.3.121 – 10.20.3.12110.20.3.121
5910.20.3.122/3210.20.3.122 – 10.20.3.12210.20.3.122
6010.20.3.123/3210.20.3.123 – 10.20.3.12310.20.3.123
6110.20.3.124/3210.20.3.124 – 10.20.3.12410.20.3.124
6210.20.3.125/3210.20.3.125 – 10.20.3.12510.20.3.125
6310.20.3.126/3210.20.3.126 – 10.20.3.12610.20.3.126
6410.20.3.127/3210.20.3.127 – 10.20.3.12710.20.3.127
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 →