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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)10.2.61.0/25
network10.2.61.0/25
broadcast10.2.61.127
first host10.2.61.1
last host10.2.61.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.61.0/25
address00001010.00000010.00111101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00111101.00000000
broadcast00001010.00000010.00111101.01111111
green = network part, grey = host part
hex0x0a023d00
decimal167918848
reverse dns0.61.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3d00

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.61.0/3010.2.61.1 – 10.2.61.210.2.61.3
210.2.61.4/3010.2.61.5 – 10.2.61.610.2.61.7
310.2.61.8/3010.2.61.9 – 10.2.61.1010.2.61.11
410.2.61.12/3010.2.61.13 – 10.2.61.1410.2.61.15
510.2.61.16/3010.2.61.17 – 10.2.61.1810.2.61.19
610.2.61.20/3010.2.61.21 – 10.2.61.2210.2.61.23
710.2.61.24/3010.2.61.25 – 10.2.61.2610.2.61.27
810.2.61.28/3010.2.61.29 – 10.2.61.3010.2.61.31
910.2.61.32/3010.2.61.33 – 10.2.61.3410.2.61.35
1010.2.61.36/3010.2.61.37 – 10.2.61.3810.2.61.39
1110.2.61.40/3010.2.61.41 – 10.2.61.4210.2.61.43
1210.2.61.44/3010.2.61.45 – 10.2.61.4610.2.61.47
1310.2.61.48/3010.2.61.49 – 10.2.61.5010.2.61.51
1410.2.61.52/3010.2.61.53 – 10.2.61.5410.2.61.55
1510.2.61.56/3010.2.61.57 – 10.2.61.5810.2.61.59
1610.2.61.60/3010.2.61.61 – 10.2.61.6210.2.61.63
1710.2.61.64/3010.2.61.65 – 10.2.61.6610.2.61.67
1810.2.61.68/3010.2.61.69 – 10.2.61.7010.2.61.71
1910.2.61.72/3010.2.61.73 – 10.2.61.7410.2.61.75
2010.2.61.76/3010.2.61.77 – 10.2.61.7810.2.61.79
2110.2.61.80/3010.2.61.81 – 10.2.61.8210.2.61.83
2210.2.61.84/3010.2.61.85 – 10.2.61.8610.2.61.87
2310.2.61.88/3010.2.61.89 – 10.2.61.9010.2.61.91
2410.2.61.92/3010.2.61.93 – 10.2.61.9410.2.61.95
2510.2.61.96/3010.2.61.97 – 10.2.61.9810.2.61.99
2610.2.61.100/3010.2.61.101 – 10.2.61.10210.2.61.103
2710.2.61.104/3010.2.61.105 – 10.2.61.10610.2.61.107
2810.2.61.108/3010.2.61.109 – 10.2.61.11010.2.61.111
2910.2.61.112/3010.2.61.113 – 10.2.61.11410.2.61.115
3010.2.61.116/3010.2.61.117 – 10.2.61.11810.2.61.119
3110.2.61.120/3010.2.61.121 – 10.2.61.12210.2.61.123
3210.2.61.124/3010.2.61.125 – 10.2.61.12610.2.61.127
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 →