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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)10.45.231.0/25
network10.45.231.0/25
broadcast10.45.231.127
first host10.45.231.1
last host10.45.231.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.45.231.0/25
address00001010.00101101.11100111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00101101.11100111.00000000
broadcast00001010.00101101.11100111.01111111
green = network part, grey = host part
hex0x0a2de700
decimal170780416
reverse dns0.231.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:e700

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.45.231.0/3010.45.231.1 – 10.45.231.210.45.231.3
210.45.231.4/3010.45.231.5 – 10.45.231.610.45.231.7
310.45.231.8/3010.45.231.9 – 10.45.231.1010.45.231.11
410.45.231.12/3010.45.231.13 – 10.45.231.1410.45.231.15
510.45.231.16/3010.45.231.17 – 10.45.231.1810.45.231.19
610.45.231.20/3010.45.231.21 – 10.45.231.2210.45.231.23
710.45.231.24/3010.45.231.25 – 10.45.231.2610.45.231.27
810.45.231.28/3010.45.231.29 – 10.45.231.3010.45.231.31
910.45.231.32/3010.45.231.33 – 10.45.231.3410.45.231.35
1010.45.231.36/3010.45.231.37 – 10.45.231.3810.45.231.39
1110.45.231.40/3010.45.231.41 – 10.45.231.4210.45.231.43
1210.45.231.44/3010.45.231.45 – 10.45.231.4610.45.231.47
1310.45.231.48/3010.45.231.49 – 10.45.231.5010.45.231.51
1410.45.231.52/3010.45.231.53 – 10.45.231.5410.45.231.55
1510.45.231.56/3010.45.231.57 – 10.45.231.5810.45.231.59
1610.45.231.60/3010.45.231.61 – 10.45.231.6210.45.231.63
1710.45.231.64/3010.45.231.65 – 10.45.231.6610.45.231.67
1810.45.231.68/3010.45.231.69 – 10.45.231.7010.45.231.71
1910.45.231.72/3010.45.231.73 – 10.45.231.7410.45.231.75
2010.45.231.76/3010.45.231.77 – 10.45.231.7810.45.231.79
2110.45.231.80/3010.45.231.81 – 10.45.231.8210.45.231.83
2210.45.231.84/3010.45.231.85 – 10.45.231.8610.45.231.87
2310.45.231.88/3010.45.231.89 – 10.45.231.9010.45.231.91
2410.45.231.92/3010.45.231.93 – 10.45.231.9410.45.231.95
2510.45.231.96/3010.45.231.97 – 10.45.231.9810.45.231.99
2610.45.231.100/3010.45.231.101 – 10.45.231.10210.45.231.103
2710.45.231.104/3010.45.231.105 – 10.45.231.10610.45.231.107
2810.45.231.108/3010.45.231.109 – 10.45.231.11010.45.231.111
2910.45.231.112/3010.45.231.113 – 10.45.231.11410.45.231.115
3010.45.231.116/3010.45.231.117 – 10.45.231.11810.45.231.119
3110.45.231.120/3010.45.231.121 – 10.45.231.12210.45.231.123
3210.45.231.124/3010.45.231.125 – 10.45.231.12610.45.231.127
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →