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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)10.78.89.192/26
network10.78.89.192/26
broadcast10.78.89.255
first host10.78.89.193
last host10.78.89.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.78.89.192/26
address00001010.01001110.01011001.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.01001110.01011001.11000000
broadcast00001010.01001110.01011001.11111111
green = network part, grey = host part
hex0x0a4e59c0
decimal172906944
reverse dns192.89.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:59c0

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.89.192/3110.78.89.192 – 10.78.89.19310.78.89.193
210.78.89.194/3110.78.89.194 – 10.78.89.19510.78.89.195
310.78.89.196/3110.78.89.196 – 10.78.89.19710.78.89.197
410.78.89.198/3110.78.89.198 – 10.78.89.19910.78.89.199
510.78.89.200/3110.78.89.200 – 10.78.89.20110.78.89.201
610.78.89.202/3110.78.89.202 – 10.78.89.20310.78.89.203
710.78.89.204/3110.78.89.204 – 10.78.89.20510.78.89.205
810.78.89.206/3110.78.89.206 – 10.78.89.20710.78.89.207
910.78.89.208/3110.78.89.208 – 10.78.89.20910.78.89.209
1010.78.89.210/3110.78.89.210 – 10.78.89.21110.78.89.211
1110.78.89.212/3110.78.89.212 – 10.78.89.21310.78.89.213
1210.78.89.214/3110.78.89.214 – 10.78.89.21510.78.89.215
1310.78.89.216/3110.78.89.216 – 10.78.89.21710.78.89.217
1410.78.89.218/3110.78.89.218 – 10.78.89.21910.78.89.219
1510.78.89.220/3110.78.89.220 – 10.78.89.22110.78.89.221
1610.78.89.222/3110.78.89.222 – 10.78.89.22310.78.89.223
1710.78.89.224/3110.78.89.224 – 10.78.89.22510.78.89.225
1810.78.89.226/3110.78.89.226 – 10.78.89.22710.78.89.227
1910.78.89.228/3110.78.89.228 – 10.78.89.22910.78.89.229
2010.78.89.230/3110.78.89.230 – 10.78.89.23110.78.89.231
2110.78.89.232/3110.78.89.232 – 10.78.89.23310.78.89.233
2210.78.89.234/3110.78.89.234 – 10.78.89.23510.78.89.235
2310.78.89.236/3110.78.89.236 – 10.78.89.23710.78.89.237
2410.78.89.238/3110.78.89.238 – 10.78.89.23910.78.89.239
2510.78.89.240/3110.78.89.240 – 10.78.89.24110.78.89.241
2610.78.89.242/3110.78.89.242 – 10.78.89.24310.78.89.243
2710.78.89.244/3110.78.89.244 – 10.78.89.24510.78.89.245
2810.78.89.246/3110.78.89.246 – 10.78.89.24710.78.89.247
2910.78.89.248/3110.78.89.248 – 10.78.89.24910.78.89.249
3010.78.89.250/3110.78.89.250 – 10.78.89.25110.78.89.251
3110.78.89.252/3110.78.89.252 – 10.78.89.25310.78.89.253
3210.78.89.254/3110.78.89.254 – 10.78.89.25510.78.89.255
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 →