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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)10.2.121.192/26
network10.2.121.192/26
broadcast10.2.121.255
first host10.2.121.193
last host10.2.121.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.121.192/26
address00001010.00000010.01111001.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.01111001.11000000
broadcast00001010.00000010.01111001.11111111
green = network part, grey = host part
hex0x0a0279c0
decimal167934400
reverse dns192.121.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:79c0

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.121.192/3110.2.121.192 – 10.2.121.19310.2.121.193
210.2.121.194/3110.2.121.194 – 10.2.121.19510.2.121.195
310.2.121.196/3110.2.121.196 – 10.2.121.19710.2.121.197
410.2.121.198/3110.2.121.198 – 10.2.121.19910.2.121.199
510.2.121.200/3110.2.121.200 – 10.2.121.20110.2.121.201
610.2.121.202/3110.2.121.202 – 10.2.121.20310.2.121.203
710.2.121.204/3110.2.121.204 – 10.2.121.20510.2.121.205
810.2.121.206/3110.2.121.206 – 10.2.121.20710.2.121.207
910.2.121.208/3110.2.121.208 – 10.2.121.20910.2.121.209
1010.2.121.210/3110.2.121.210 – 10.2.121.21110.2.121.211
1110.2.121.212/3110.2.121.212 – 10.2.121.21310.2.121.213
1210.2.121.214/3110.2.121.214 – 10.2.121.21510.2.121.215
1310.2.121.216/3110.2.121.216 – 10.2.121.21710.2.121.217
1410.2.121.218/3110.2.121.218 – 10.2.121.21910.2.121.219
1510.2.121.220/3110.2.121.220 – 10.2.121.22110.2.121.221
1610.2.121.222/3110.2.121.222 – 10.2.121.22310.2.121.223
1710.2.121.224/3110.2.121.224 – 10.2.121.22510.2.121.225
1810.2.121.226/3110.2.121.226 – 10.2.121.22710.2.121.227
1910.2.121.228/3110.2.121.228 – 10.2.121.22910.2.121.229
2010.2.121.230/3110.2.121.230 – 10.2.121.23110.2.121.231
2110.2.121.232/3110.2.121.232 – 10.2.121.23310.2.121.233
2210.2.121.234/3110.2.121.234 – 10.2.121.23510.2.121.235
2310.2.121.236/3110.2.121.236 – 10.2.121.23710.2.121.237
2410.2.121.238/3110.2.121.238 – 10.2.121.23910.2.121.239
2510.2.121.240/3110.2.121.240 – 10.2.121.24110.2.121.241
2610.2.121.242/3110.2.121.242 – 10.2.121.24310.2.121.243
2710.2.121.244/3110.2.121.244 – 10.2.121.24510.2.121.245
2810.2.121.246/3110.2.121.246 – 10.2.121.24710.2.121.247
2910.2.121.248/3110.2.121.248 – 10.2.121.24910.2.121.249
3010.2.121.250/3110.2.121.250 – 10.2.121.25110.2.121.251
3110.2.121.252/3110.2.121.252 – 10.2.121.25310.2.121.253
3210.2.121.254/3110.2.121.254 – 10.2.121.25510.2.121.255
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 →