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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)10.4.3.192/27
network10.4.3.192/27
broadcast10.4.3.223
first host10.4.3.193
last host10.4.3.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.4.3.192/27
address00001010.00000100.00000011.11000000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000100.00000011.11000000
broadcast00001010.00000100.00000011.11011111
green = network part, grey = host part
hex0x0a0403c0
decimal168035264
reverse dns192.3.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:3c0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.4.3.192/3210.4.3.192 – 10.4.3.19210.4.3.192
210.4.3.193/3210.4.3.193 – 10.4.3.19310.4.3.193
310.4.3.194/3210.4.3.194 – 10.4.3.19410.4.3.194
410.4.3.195/3210.4.3.195 – 10.4.3.19510.4.3.195
510.4.3.196/3210.4.3.196 – 10.4.3.19610.4.3.196
610.4.3.197/3210.4.3.197 – 10.4.3.19710.4.3.197
710.4.3.198/3210.4.3.198 – 10.4.3.19810.4.3.198
810.4.3.199/3210.4.3.199 – 10.4.3.19910.4.3.199
910.4.3.200/3210.4.3.200 – 10.4.3.20010.4.3.200
1010.4.3.201/3210.4.3.201 – 10.4.3.20110.4.3.201
1110.4.3.202/3210.4.3.202 – 10.4.3.20210.4.3.202
1210.4.3.203/3210.4.3.203 – 10.4.3.20310.4.3.203
1310.4.3.204/3210.4.3.204 – 10.4.3.20410.4.3.204
1410.4.3.205/3210.4.3.205 – 10.4.3.20510.4.3.205
1510.4.3.206/3210.4.3.206 – 10.4.3.20610.4.3.206
1610.4.3.207/3210.4.3.207 – 10.4.3.20710.4.3.207
1710.4.3.208/3210.4.3.208 – 10.4.3.20810.4.3.208
1810.4.3.209/3210.4.3.209 – 10.4.3.20910.4.3.209
1910.4.3.210/3210.4.3.210 – 10.4.3.21010.4.3.210
2010.4.3.211/3210.4.3.211 – 10.4.3.21110.4.3.211
2110.4.3.212/3210.4.3.212 – 10.4.3.21210.4.3.212
2210.4.3.213/3210.4.3.213 – 10.4.3.21310.4.3.213
2310.4.3.214/3210.4.3.214 – 10.4.3.21410.4.3.214
2410.4.3.215/3210.4.3.215 – 10.4.3.21510.4.3.215
2510.4.3.216/3210.4.3.216 – 10.4.3.21610.4.3.216
2610.4.3.217/3210.4.3.217 – 10.4.3.21710.4.3.217
2710.4.3.218/3210.4.3.218 – 10.4.3.21810.4.3.218
2810.4.3.219/3210.4.3.219 – 10.4.3.21910.4.3.219
2910.4.3.220/3210.4.3.220 – 10.4.3.22010.4.3.220
3010.4.3.221/3210.4.3.221 – 10.4.3.22110.4.3.221
3110.4.3.222/3210.4.3.222 – 10.4.3.22210.4.3.222
3210.4.3.223/3210.4.3.223 – 10.4.3.22310.4.3.223
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 →