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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)10.78.9.192/27
network10.78.9.192/27
broadcast10.78.9.223
first host10.78.9.193
last host10.78.9.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.78.9.192/27
address00001010.01001110.00001001.11000000
subnet mask11111111.11111111.11111111.11100000
network00001010.01001110.00001001.11000000
broadcast00001010.01001110.00001001.11011111
green = network part, grey = host part
hex0x0a4e09c0
decimal172886464
reverse dns192.9.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:9c0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.9.192/3210.78.9.192 – 10.78.9.19210.78.9.192
210.78.9.193/3210.78.9.193 – 10.78.9.19310.78.9.193
310.78.9.194/3210.78.9.194 – 10.78.9.19410.78.9.194
410.78.9.195/3210.78.9.195 – 10.78.9.19510.78.9.195
510.78.9.196/3210.78.9.196 – 10.78.9.19610.78.9.196
610.78.9.197/3210.78.9.197 – 10.78.9.19710.78.9.197
710.78.9.198/3210.78.9.198 – 10.78.9.19810.78.9.198
810.78.9.199/3210.78.9.199 – 10.78.9.19910.78.9.199
910.78.9.200/3210.78.9.200 – 10.78.9.20010.78.9.200
1010.78.9.201/3210.78.9.201 – 10.78.9.20110.78.9.201
1110.78.9.202/3210.78.9.202 – 10.78.9.20210.78.9.202
1210.78.9.203/3210.78.9.203 – 10.78.9.20310.78.9.203
1310.78.9.204/3210.78.9.204 – 10.78.9.20410.78.9.204
1410.78.9.205/3210.78.9.205 – 10.78.9.20510.78.9.205
1510.78.9.206/3210.78.9.206 – 10.78.9.20610.78.9.206
1610.78.9.207/3210.78.9.207 – 10.78.9.20710.78.9.207
1710.78.9.208/3210.78.9.208 – 10.78.9.20810.78.9.208
1810.78.9.209/3210.78.9.209 – 10.78.9.20910.78.9.209
1910.78.9.210/3210.78.9.210 – 10.78.9.21010.78.9.210
2010.78.9.211/3210.78.9.211 – 10.78.9.21110.78.9.211
2110.78.9.212/3210.78.9.212 – 10.78.9.21210.78.9.212
2210.78.9.213/3210.78.9.213 – 10.78.9.21310.78.9.213
2310.78.9.214/3210.78.9.214 – 10.78.9.21410.78.9.214
2410.78.9.215/3210.78.9.215 – 10.78.9.21510.78.9.215
2510.78.9.216/3210.78.9.216 – 10.78.9.21610.78.9.216
2610.78.9.217/3210.78.9.217 – 10.78.9.21710.78.9.217
2710.78.9.218/3210.78.9.218 – 10.78.9.21810.78.9.218
2810.78.9.219/3210.78.9.219 – 10.78.9.21910.78.9.219
2910.78.9.220/3210.78.9.220 – 10.78.9.22010.78.9.220
3010.78.9.221/3210.78.9.221 – 10.78.9.22110.78.9.221
3110.78.9.222/3210.78.9.222 – 10.78.9.22210.78.9.222
3210.78.9.223/3210.78.9.223 – 10.78.9.22310.78.9.223
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 →