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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)10.4.23.64/26
network10.4.23.64/26
broadcast10.4.23.127
first host10.4.23.65
last host10.4.23.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.4.23.64/26
address00001010.00000100.00010111.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000100.00010111.01000000
broadcast00001010.00000100.00010111.01111111
green = network part, grey = host part
hex0x0a041740
decimal168040256
reverse dns64.23.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:1740

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.23.64/3210.4.23.64 – 10.4.23.6410.4.23.64
210.4.23.65/3210.4.23.65 – 10.4.23.6510.4.23.65
310.4.23.66/3210.4.23.66 – 10.4.23.6610.4.23.66
410.4.23.67/3210.4.23.67 – 10.4.23.6710.4.23.67
510.4.23.68/3210.4.23.68 – 10.4.23.6810.4.23.68
610.4.23.69/3210.4.23.69 – 10.4.23.6910.4.23.69
710.4.23.70/3210.4.23.70 – 10.4.23.7010.4.23.70
810.4.23.71/3210.4.23.71 – 10.4.23.7110.4.23.71
910.4.23.72/3210.4.23.72 – 10.4.23.7210.4.23.72
1010.4.23.73/3210.4.23.73 – 10.4.23.7310.4.23.73
1110.4.23.74/3210.4.23.74 – 10.4.23.7410.4.23.74
1210.4.23.75/3210.4.23.75 – 10.4.23.7510.4.23.75
1310.4.23.76/3210.4.23.76 – 10.4.23.7610.4.23.76
1410.4.23.77/3210.4.23.77 – 10.4.23.7710.4.23.77
1510.4.23.78/3210.4.23.78 – 10.4.23.7810.4.23.78
1610.4.23.79/3210.4.23.79 – 10.4.23.7910.4.23.79
1710.4.23.80/3210.4.23.80 – 10.4.23.8010.4.23.80
1810.4.23.81/3210.4.23.81 – 10.4.23.8110.4.23.81
1910.4.23.82/3210.4.23.82 – 10.4.23.8210.4.23.82
2010.4.23.83/3210.4.23.83 – 10.4.23.8310.4.23.83
2110.4.23.84/3210.4.23.84 – 10.4.23.8410.4.23.84
2210.4.23.85/3210.4.23.85 – 10.4.23.8510.4.23.85
2310.4.23.86/3210.4.23.86 – 10.4.23.8610.4.23.86
2410.4.23.87/3210.4.23.87 – 10.4.23.8710.4.23.87
2510.4.23.88/3210.4.23.88 – 10.4.23.8810.4.23.88
2610.4.23.89/3210.4.23.89 – 10.4.23.8910.4.23.89
2710.4.23.90/3210.4.23.90 – 10.4.23.9010.4.23.90
2810.4.23.91/3210.4.23.91 – 10.4.23.9110.4.23.91
2910.4.23.92/3210.4.23.92 – 10.4.23.9210.4.23.92
3010.4.23.93/3210.4.23.93 – 10.4.23.9310.4.23.93
3110.4.23.94/3210.4.23.94 – 10.4.23.9410.4.23.94
3210.4.23.95/3210.4.23.95 – 10.4.23.9510.4.23.95
3310.4.23.96/3210.4.23.96 – 10.4.23.9610.4.23.96
3410.4.23.97/3210.4.23.97 – 10.4.23.9710.4.23.97
3510.4.23.98/3210.4.23.98 – 10.4.23.9810.4.23.98
3610.4.23.99/3210.4.23.99 – 10.4.23.9910.4.23.99
3710.4.23.100/3210.4.23.100 – 10.4.23.10010.4.23.100
3810.4.23.101/3210.4.23.101 – 10.4.23.10110.4.23.101
3910.4.23.102/3210.4.23.102 – 10.4.23.10210.4.23.102
4010.4.23.103/3210.4.23.103 – 10.4.23.10310.4.23.103
4110.4.23.104/3210.4.23.104 – 10.4.23.10410.4.23.104
4210.4.23.105/3210.4.23.105 – 10.4.23.10510.4.23.105
4310.4.23.106/3210.4.23.106 – 10.4.23.10610.4.23.106
4410.4.23.107/3210.4.23.107 – 10.4.23.10710.4.23.107
4510.4.23.108/3210.4.23.108 – 10.4.23.10810.4.23.108
4610.4.23.109/3210.4.23.109 – 10.4.23.10910.4.23.109
4710.4.23.110/3210.4.23.110 – 10.4.23.11010.4.23.110
4810.4.23.111/3210.4.23.111 – 10.4.23.11110.4.23.111
4910.4.23.112/3210.4.23.112 – 10.4.23.11210.4.23.112
5010.4.23.113/3210.4.23.113 – 10.4.23.11310.4.23.113
5110.4.23.114/3210.4.23.114 – 10.4.23.11410.4.23.114
5210.4.23.115/3210.4.23.115 – 10.4.23.11510.4.23.115
5310.4.23.116/3210.4.23.116 – 10.4.23.11610.4.23.116
5410.4.23.117/3210.4.23.117 – 10.4.23.11710.4.23.117
5510.4.23.118/3210.4.23.118 – 10.4.23.11810.4.23.118
5610.4.23.119/3210.4.23.119 – 10.4.23.11910.4.23.119
5710.4.23.120/3210.4.23.120 – 10.4.23.12010.4.23.120
5810.4.23.121/3210.4.23.121 – 10.4.23.12110.4.23.121
5910.4.23.122/3210.4.23.122 – 10.4.23.12210.4.23.122
6010.4.23.123/3210.4.23.123 – 10.4.23.12310.4.23.123
6110.4.23.124/3210.4.23.124 – 10.4.23.12410.4.23.124
6210.4.23.125/3210.4.23.125 – 10.4.23.12510.4.23.125
6310.4.23.126/3210.4.23.126 – 10.4.23.12610.4.23.126
6410.4.23.127/3210.4.23.127 – 10.4.23.12710.4.23.127
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 →