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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)10.167.251.192/27
network10.167.251.192/27
broadcast10.167.251.223
first host10.167.251.193
last host10.167.251.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.167.251.192/27
address00001010.10100111.11111011.11000000
subnet mask11111111.11111111.11111111.11100000
network00001010.10100111.11111011.11000000
broadcast00001010.10100111.11111011.11011111
green = network part, grey = host part
hex0x0aa7fbc0
decimal178781120
reverse dns192.251.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:fbc0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.251.192/3210.167.251.192 – 10.167.251.19210.167.251.192
210.167.251.193/3210.167.251.193 – 10.167.251.19310.167.251.193
310.167.251.194/3210.167.251.194 – 10.167.251.19410.167.251.194
410.167.251.195/3210.167.251.195 – 10.167.251.19510.167.251.195
510.167.251.196/3210.167.251.196 – 10.167.251.19610.167.251.196
610.167.251.197/3210.167.251.197 – 10.167.251.19710.167.251.197
710.167.251.198/3210.167.251.198 – 10.167.251.19810.167.251.198
810.167.251.199/3210.167.251.199 – 10.167.251.19910.167.251.199
910.167.251.200/3210.167.251.200 – 10.167.251.20010.167.251.200
1010.167.251.201/3210.167.251.201 – 10.167.251.20110.167.251.201
1110.167.251.202/3210.167.251.202 – 10.167.251.20210.167.251.202
1210.167.251.203/3210.167.251.203 – 10.167.251.20310.167.251.203
1310.167.251.204/3210.167.251.204 – 10.167.251.20410.167.251.204
1410.167.251.205/3210.167.251.205 – 10.167.251.20510.167.251.205
1510.167.251.206/3210.167.251.206 – 10.167.251.20610.167.251.206
1610.167.251.207/3210.167.251.207 – 10.167.251.20710.167.251.207
1710.167.251.208/3210.167.251.208 – 10.167.251.20810.167.251.208
1810.167.251.209/3210.167.251.209 – 10.167.251.20910.167.251.209
1910.167.251.210/3210.167.251.210 – 10.167.251.21010.167.251.210
2010.167.251.211/3210.167.251.211 – 10.167.251.21110.167.251.211
2110.167.251.212/3210.167.251.212 – 10.167.251.21210.167.251.212
2210.167.251.213/3210.167.251.213 – 10.167.251.21310.167.251.213
2310.167.251.214/3210.167.251.214 – 10.167.251.21410.167.251.214
2410.167.251.215/3210.167.251.215 – 10.167.251.21510.167.251.215
2510.167.251.216/3210.167.251.216 – 10.167.251.21610.167.251.216
2610.167.251.217/3210.167.251.217 – 10.167.251.21710.167.251.217
2710.167.251.218/3210.167.251.218 – 10.167.251.21810.167.251.218
2810.167.251.219/3210.167.251.219 – 10.167.251.21910.167.251.219
2910.167.251.220/3210.167.251.220 – 10.167.251.22010.167.251.220
3010.167.251.221/3210.167.251.221 – 10.167.251.22110.167.251.221
3110.167.251.222/3210.167.251.222 – 10.167.251.22210.167.251.222
3210.167.251.223/3210.167.251.223 – 10.167.251.22310.167.251.223
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /27
/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-
/26255.255.255.1926462-
/27255.255.255.22432301
/28255.255.255.24016142 split →
/29255.255.255.248864 split →
/30255.255.255.252428 split →
/31255.255.255.2542216 split →
/32255.255.255.2551132 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 →