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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)10.71.43.64/26
network10.71.43.64/26
broadcast10.71.43.127
first host10.71.43.65
last host10.71.43.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.71.43.64/26
address00001010.01000111.00101011.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.01000111.00101011.01000000
broadcast00001010.01000111.00101011.01111111
green = network part, grey = host part
hex0x0a472b40
decimal172436288
reverse dns64.43.71.10.in-addr.arpa
ipv4-mapped::ffff:a47:2b40

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.71.43.64/3210.71.43.64 – 10.71.43.6410.71.43.64
210.71.43.65/3210.71.43.65 – 10.71.43.6510.71.43.65
310.71.43.66/3210.71.43.66 – 10.71.43.6610.71.43.66
410.71.43.67/3210.71.43.67 – 10.71.43.6710.71.43.67
510.71.43.68/3210.71.43.68 – 10.71.43.6810.71.43.68
610.71.43.69/3210.71.43.69 – 10.71.43.6910.71.43.69
710.71.43.70/3210.71.43.70 – 10.71.43.7010.71.43.70
810.71.43.71/3210.71.43.71 – 10.71.43.7110.71.43.71
910.71.43.72/3210.71.43.72 – 10.71.43.7210.71.43.72
1010.71.43.73/3210.71.43.73 – 10.71.43.7310.71.43.73
1110.71.43.74/3210.71.43.74 – 10.71.43.7410.71.43.74
1210.71.43.75/3210.71.43.75 – 10.71.43.7510.71.43.75
1310.71.43.76/3210.71.43.76 – 10.71.43.7610.71.43.76
1410.71.43.77/3210.71.43.77 – 10.71.43.7710.71.43.77
1510.71.43.78/3210.71.43.78 – 10.71.43.7810.71.43.78
1610.71.43.79/3210.71.43.79 – 10.71.43.7910.71.43.79
1710.71.43.80/3210.71.43.80 – 10.71.43.8010.71.43.80
1810.71.43.81/3210.71.43.81 – 10.71.43.8110.71.43.81
1910.71.43.82/3210.71.43.82 – 10.71.43.8210.71.43.82
2010.71.43.83/3210.71.43.83 – 10.71.43.8310.71.43.83
2110.71.43.84/3210.71.43.84 – 10.71.43.8410.71.43.84
2210.71.43.85/3210.71.43.85 – 10.71.43.8510.71.43.85
2310.71.43.86/3210.71.43.86 – 10.71.43.8610.71.43.86
2410.71.43.87/3210.71.43.87 – 10.71.43.8710.71.43.87
2510.71.43.88/3210.71.43.88 – 10.71.43.8810.71.43.88
2610.71.43.89/3210.71.43.89 – 10.71.43.8910.71.43.89
2710.71.43.90/3210.71.43.90 – 10.71.43.9010.71.43.90
2810.71.43.91/3210.71.43.91 – 10.71.43.9110.71.43.91
2910.71.43.92/3210.71.43.92 – 10.71.43.9210.71.43.92
3010.71.43.93/3210.71.43.93 – 10.71.43.9310.71.43.93
3110.71.43.94/3210.71.43.94 – 10.71.43.9410.71.43.94
3210.71.43.95/3210.71.43.95 – 10.71.43.9510.71.43.95
3310.71.43.96/3210.71.43.96 – 10.71.43.9610.71.43.96
3410.71.43.97/3210.71.43.97 – 10.71.43.9710.71.43.97
3510.71.43.98/3210.71.43.98 – 10.71.43.9810.71.43.98
3610.71.43.99/3210.71.43.99 – 10.71.43.9910.71.43.99
3710.71.43.100/3210.71.43.100 – 10.71.43.10010.71.43.100
3810.71.43.101/3210.71.43.101 – 10.71.43.10110.71.43.101
3910.71.43.102/3210.71.43.102 – 10.71.43.10210.71.43.102
4010.71.43.103/3210.71.43.103 – 10.71.43.10310.71.43.103
4110.71.43.104/3210.71.43.104 – 10.71.43.10410.71.43.104
4210.71.43.105/3210.71.43.105 – 10.71.43.10510.71.43.105
4310.71.43.106/3210.71.43.106 – 10.71.43.10610.71.43.106
4410.71.43.107/3210.71.43.107 – 10.71.43.10710.71.43.107
4510.71.43.108/3210.71.43.108 – 10.71.43.10810.71.43.108
4610.71.43.109/3210.71.43.109 – 10.71.43.10910.71.43.109
4710.71.43.110/3210.71.43.110 – 10.71.43.11010.71.43.110
4810.71.43.111/3210.71.43.111 – 10.71.43.11110.71.43.111
4910.71.43.112/3210.71.43.112 – 10.71.43.11210.71.43.112
5010.71.43.113/3210.71.43.113 – 10.71.43.11310.71.43.113
5110.71.43.114/3210.71.43.114 – 10.71.43.11410.71.43.114
5210.71.43.115/3210.71.43.115 – 10.71.43.11510.71.43.115
5310.71.43.116/3210.71.43.116 – 10.71.43.11610.71.43.116
5410.71.43.117/3210.71.43.117 – 10.71.43.11710.71.43.117
5510.71.43.118/3210.71.43.118 – 10.71.43.11810.71.43.118
5610.71.43.119/3210.71.43.119 – 10.71.43.11910.71.43.119
5710.71.43.120/3210.71.43.120 – 10.71.43.12010.71.43.120
5810.71.43.121/3210.71.43.121 – 10.71.43.12110.71.43.121
5910.71.43.122/3210.71.43.122 – 10.71.43.12210.71.43.122
6010.71.43.123/3210.71.43.123 – 10.71.43.12310.71.43.123
6110.71.43.124/3210.71.43.124 – 10.71.43.12410.71.43.124
6210.71.43.125/3210.71.43.125 – 10.71.43.12510.71.43.125
6310.71.43.126/3210.71.43.126 – 10.71.43.12610.71.43.126
6410.71.43.127/3210.71.43.127 – 10.71.43.12710.71.43.127
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 →