When refering to IP addresses, what does /16, /32 etc. mean? - GoFuckYourself.com

Tempest · 02-07-2007, 03:08 PM

Often times you'll some address spaces defined as 100.100.100.100/16 etc... so what does that /16 /32, /64 etc. mean? i.e. what address space does that define?

darling2 · 02-07-2007, 03:13 PM

these numbers mean how many bits of the IP address you want to keep in the IP address range.

example
123.45.0.0/16 means all ip addresses from 123.45.0.0 to 123.45.255.255
123.45.67.0/24 means all ip addresses from 123.45.67.0 to 123.45.67.255
123.45.67.89/32 means just this IP address.

DutchTeenCash · 02-07-2007, 03:14 PM

yup

thats how dailercompanies give access to certain server in their htaccess, range 0-16 for instance

BoobyDuty · 02-07-2007, 03:18 PM

i know i didn't ask for this info but i can certainly say thanks! i was wondering the same thing myself!

Validus · 02-07-2007, 03:22 PM

Good info for sure! Thanks!

Tempest · 02-07-2007, 03:39 PM

Quote:

Originally Posted by darling2

these numbers mean how many bits of the IP address you want to keep in the IP address range.

example
123.45.0.0/16 means all ip addresses from 123.45.0.0 to 123.45.255.255
123.45.67.0/24 means all ip addresses from 123.45.67.0 to 123.45.67.255
123.45.67.89/32 means just this IP address.

Interesting... So if I had an adress defined like this:

123.45.67.128/28

That would mean 16 addresses from 123.45.67.128 to 123.45.67.143??

Tempest · 02-07-2007, 05:27 PM

Bump....

riddler · 02-07-2007, 05:34 PM

Quote:

Originally Posted by Tempest

Interesting... So if I had an adress defined like this:

123.45.67.128/28

That would mean 16 addresses from 123.45.67.128 to 123.45.67.143??

i think so

x-zoom · 02-08-2007, 01:19 AM

You might want to take a look here: http://www.ralphb.net/IPSubnet/class_a.html
A /28 is indeed 16 addresses in total; 14 usable with 1 network and 1 broadcast address.

rowan · 02-08-2007, 02:10 AM

Quote:

Originally Posted by x-zoom

You might want to take a look here: http://www.ralphb.net/IPSubnet/class_a.html
A /28 is indeed 16 addresses in total; 14 usable with 1 network and 1 broadcast address.

Unless you're using a funky ethernet switch that pretends to be on a /24 subnet so you can use IPs that would have been reserved for network and broadcast

madawgz · 02-08-2007, 02:14 AM

thats cool, i didnt know that

02-07-2007, 03:08 PM	#1
Tempest Too lazy to set a custom title Industry Role: Join Date: May 2004 Location: West Coast, Canada. Posts: 10,217	When refering to IP addresses, what does /16, /32 etc. mean? Often times you'll some address spaces defined as 100.100.100.100/16 etc... so what does that /16 /32, /64 etc. mean? i.e. what address space does that define?

02-07-2007, 03:14 PM	#3
DutchTeenCash I like Dutch Girls Join Date: Feb 2003 Location: dutchteencash.com Posts: 21,684	yup thats how dailercompanies give access to certain server in their htaccess, range 0-16 for instance __________________ ICQ 16 91 547 - SKYPE dutchteencash bob AT dutchteencash DOT com ... did you see our newest Sweet Natural Girl Priscilla (18)?

02-07-2007, 03:18 PM	#4
BoobyDuty Confirmed User Join Date: Oct 2006 Location: Between BooBs Posts: 186	i know i didn't ask for this info but i can certainly say thanks! i was wondering the same thing myself! __________________ BoobyDuty // webmaster [at] boobyduty.com // ICQ: 441-081-540

02-08-2007, 01:19 AM	#9
x-zoom Confirmed User Join Date: Jan 2007 Location: NL Posts: 398	You might want to take a look here: http://www.ralphb.net/IPSubnet/class_a.html A /28 is indeed 16 addresses in total; 14 usable with 1 network and 1 broadcast address. __________________

02-08-2007, 02:14 AM	#11
madawgz 8.8.8.8 Industry Role: Join Date: Mar 2006 Location: Noordermarkt Posts: 30,509	thats cool, i didnt know that __________________ TAEMDLRMSKRJIXMRLSMRJ.

02-07-2007, 03:13 PM	#2
darling2 Confirmed User Join Date: Jul 2006 Posts: 345	these numbers mean how many bits of the IP address you want to keep in the IP address range. example 123.45.0.0/16 means all ip addresses from 123.45.0.0 to 123.45.255.255 123.45.67.0/24 means all ip addresses from 123.45.67.0 to 123.45.67.255 123.45.67.89/32 means just this IP address.

02-07-2007, 03:22 PM	#5
Validus Confirmed User Industry Role: Join Date: Jul 2001 Location: Calgary, Canada Posts: 4,012	Good info for sure! Thanks!

02-07-2007, 05:27 PM	#7
Tempest Too lazy to set a custom title Industry Role: Join Date: May 2004 Location: West Coast, Canada. Posts: 10,217	Bump....