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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)10.3.100.192/26
network10.3.100.192/26
broadcast10.3.100.255
first host10.3.100.193
last host10.3.100.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.100.192/26
address00001010.00000011.01100100.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.01100100.11000000
broadcast00001010.00000011.01100100.11111111
green = network part, grey = host part
hex0x0a0364c0
decimal167994560
reverse dns192.100.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:64c0

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.100.192/3110.3.100.192 – 10.3.100.19310.3.100.193
210.3.100.194/3110.3.100.194 – 10.3.100.19510.3.100.195
310.3.100.196/3110.3.100.196 – 10.3.100.19710.3.100.197
410.3.100.198/3110.3.100.198 – 10.3.100.19910.3.100.199
510.3.100.200/3110.3.100.200 – 10.3.100.20110.3.100.201
610.3.100.202/3110.3.100.202 – 10.3.100.20310.3.100.203
710.3.100.204/3110.3.100.204 – 10.3.100.20510.3.100.205
810.3.100.206/3110.3.100.206 – 10.3.100.20710.3.100.207
910.3.100.208/3110.3.100.208 – 10.3.100.20910.3.100.209
1010.3.100.210/3110.3.100.210 – 10.3.100.21110.3.100.211
1110.3.100.212/3110.3.100.212 – 10.3.100.21310.3.100.213
1210.3.100.214/3110.3.100.214 – 10.3.100.21510.3.100.215
1310.3.100.216/3110.3.100.216 – 10.3.100.21710.3.100.217
1410.3.100.218/3110.3.100.218 – 10.3.100.21910.3.100.219
1510.3.100.220/3110.3.100.220 – 10.3.100.22110.3.100.221
1610.3.100.222/3110.3.100.222 – 10.3.100.22310.3.100.223
1710.3.100.224/3110.3.100.224 – 10.3.100.22510.3.100.225
1810.3.100.226/3110.3.100.226 – 10.3.100.22710.3.100.227
1910.3.100.228/3110.3.100.228 – 10.3.100.22910.3.100.229
2010.3.100.230/3110.3.100.230 – 10.3.100.23110.3.100.231
2110.3.100.232/3110.3.100.232 – 10.3.100.23310.3.100.233
2210.3.100.234/3110.3.100.234 – 10.3.100.23510.3.100.235
2310.3.100.236/3110.3.100.236 – 10.3.100.23710.3.100.237
2410.3.100.238/3110.3.100.238 – 10.3.100.23910.3.100.239
2510.3.100.240/3110.3.100.240 – 10.3.100.24110.3.100.241
2610.3.100.242/3110.3.100.242 – 10.3.100.24310.3.100.243
2710.3.100.244/3110.3.100.244 – 10.3.100.24510.3.100.245
2810.3.100.246/3110.3.100.246 – 10.3.100.24710.3.100.247
2910.3.100.248/3110.3.100.248 – 10.3.100.24910.3.100.249
3010.3.100.250/3110.3.100.250 – 10.3.100.25110.3.100.251
3110.3.100.252/3110.3.100.252 – 10.3.100.25310.3.100.253
3210.3.100.254/3110.3.100.254 – 10.3.100.25510.3.100.255
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 →