ip
ipku.in

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)10.7.88.0/21
network10.7.88.0/21
broadcast10.7.95.255
first host10.7.88.1
last host10.7.95.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.7.88.0/21
address00001010.00000111.01011000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000111.01011000.00000000
broadcast00001010.00000111.01011111.11111111
green = network part, grey = host part
hex0x0a075800
decimal168253440
reverse dns0.88.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:5800

/21 split into /32 · 2,048 subnets

close ×
#networkhost rangebroadcast
110.7.88.0/3210.7.88.0 – 10.7.88.010.7.88.0
210.7.88.1/3210.7.88.1 – 10.7.88.110.7.88.1
310.7.88.2/3210.7.88.2 – 10.7.88.210.7.88.2
410.7.88.3/3210.7.88.3 – 10.7.88.310.7.88.3
510.7.88.4/3210.7.88.4 – 10.7.88.410.7.88.4
610.7.88.5/3210.7.88.5 – 10.7.88.510.7.88.5
710.7.88.6/3210.7.88.6 – 10.7.88.610.7.88.6
810.7.88.7/3210.7.88.7 – 10.7.88.710.7.88.7
910.7.88.8/3210.7.88.8 – 10.7.88.810.7.88.8
1010.7.88.9/3210.7.88.9 – 10.7.88.910.7.88.9
1110.7.88.10/3210.7.88.10 – 10.7.88.1010.7.88.10
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2010.7.88.19/3210.7.88.19 – 10.7.88.1910.7.88.19
2110.7.88.20/3210.7.88.20 – 10.7.88.2010.7.88.20
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22910.7.88.228/3210.7.88.228 – 10.7.88.22810.7.88.228
23010.7.88.229/3210.7.88.229 – 10.7.88.22910.7.88.229
23110.7.88.230/3210.7.88.230 – 10.7.88.23010.7.88.230
23210.7.88.231/3210.7.88.231 – 10.7.88.23110.7.88.231
23310.7.88.232/3210.7.88.232 – 10.7.88.23210.7.88.232
23410.7.88.233/3210.7.88.233 – 10.7.88.23310.7.88.233
23510.7.88.234/3210.7.88.234 – 10.7.88.23410.7.88.234
23610.7.88.235/3210.7.88.235 – 10.7.88.23510.7.88.235
23710.7.88.236/3210.7.88.236 – 10.7.88.23610.7.88.236
23810.7.88.237/3210.7.88.237 – 10.7.88.23710.7.88.237
23910.7.88.238/3210.7.88.238 – 10.7.88.23810.7.88.238
24010.7.88.239/3210.7.88.239 – 10.7.88.23910.7.88.239
24110.7.88.240/3210.7.88.240 – 10.7.88.24010.7.88.240
24210.7.88.241/3210.7.88.241 – 10.7.88.24110.7.88.241
24310.7.88.242/3210.7.88.242 – 10.7.88.24210.7.88.242
24410.7.88.243/3210.7.88.243 – 10.7.88.24310.7.88.243
24510.7.88.244/3210.7.88.244 – 10.7.88.24410.7.88.244
24610.7.88.245/3210.7.88.245 – 10.7.88.24510.7.88.245
24710.7.88.246/3210.7.88.246 – 10.7.88.24610.7.88.246
24810.7.88.247/3210.7.88.247 – 10.7.88.24710.7.88.247
24910.7.88.248/3210.7.88.248 – 10.7.88.24810.7.88.248
25010.7.88.249/3210.7.88.249 – 10.7.88.24910.7.88.249
25110.7.88.250/3210.7.88.250 – 10.7.88.25010.7.88.250
25210.7.88.251/3210.7.88.251 – 10.7.88.25110.7.88.251
25310.7.88.252/3210.7.88.252 – 10.7.88.25210.7.88.252
25410.7.88.253/3210.7.88.253 – 10.7.88.25310.7.88.253
25510.7.88.254/3210.7.88.254 – 10.7.88.25410.7.88.254
25610.7.88.255/3210.7.88.255 – 10.7.88.25510.7.88.255

showing 256 of 2,048

01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /21
/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-
/21255.255.248.02,0482,0461
/22255.255.252.01,0241,0222 split →
/23255.255.254.05125104 split →
/24255.255.255.02562548 split →
/25255.255.255.12812812616 split →
/26255.255.255.192646232 split →
/27255.255.255.224323064 split →
/28255.255.255.2401614128 split →
/29255.255.255.24886256 split →
/30255.255.255.25242512 split →
/31255.255.255.254221,024 split →
/32255.255.255.255112,048 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 →