Hot Downloads

Welcome, Guest
Username: Password: Remember me

TOPIC: SUBNETTING

SUBNETTING 6 years 4 months ago #34616

  • JONNY-BOY
  • JONNY-BOY's Avatar
  • Offline
  • New Member
  • Posts: 2
  • Karma: 0
Can someone please tell me the next usable ip address in this address range: 172.20.0.1 - 172.20.31.254?
The administrator has disabled public write access.

... 6 years 3 months ago #34618

  • Arani
  • Arani's Avatar
  • Offline
  • Moderator
  • Posts: 745
  • Thank you received: 10
  • Karma: 4
Hi
That is a very big range.
The next usable IP address if I only consider the first network address i.e. 172.20.0.0 and using a default subnet mask i.e one for a class B address, it should be anything between 172.20.0.1 - 172.20.31.254.

Now you have not mentioned what the subnet mask is. So I assumed it to be 255.255.0.0. I also noticed that 172.20.x.x remained constant, making me believe that it should be part of the network address.
You can have 65536 subnets, and 65534 host IDs if you keep the same subnet mask.
Picking pebbles on the shore of the networking ocean
The administrator has disabled public write access.

Re: SUBNETTING 6 years 3 months ago #34619

  • Nevins
  • Nevins's Avatar
  • Offline
  • Expert Member
  • Posts: 438
  • Thank you received: 9
  • Karma: 4
Can someone please tell me the next usable ip address in this address range: 172.20.0.1 - 172.20.31.254?


There is a fundamental problem with the way you worded your question.


You asked for:

"The next usable ip address in this range"

- Unfortunately this implies you gave us

"The last usable ip address in this range"
(which you did not)


Based on your wording we are looking for a

NEXT


USEABLE IP ADDRESS


IN THIS RANGE


Unfortunately there is only one range that can be called "THIS"(172.20.0.1 - 172.20.31.254) and there was no LAST USEABLE IP ADDRESS defined.

The basic problem with the wording you gave is that the answer you gave has to satisfy three conditions for an ip address:

It has to be in the 172.20.0.1 - 172.20.31.254 range

It has to be "usable"

It has to be "The NEXT"


Within those three conditions the first condition is given. All ip addresses within that range are usable so the second condition is satisfied by the entire range. The third condition however is not possible to satisfy because not enough information was given.


On the other hand if you were looking for the first usable address in the next range that would be 172.20.32.1

I'm not sure that helped you at all try examining your question and re-wording it and I'll see if I can help.

A word of caution however I only point this out because word modifiers are KEY in knowing which information a question is asking for. Many times subnetting questions are modified by constraints such as:

First
Last
Within
Usable
Broadcast
Subnet ID
Next
Greater than
Less than
Optimum
Least hosts per subnet
Most hosts per subnet
Most subnets
Fewest subnets
Zero Subnet allowed
Zero Subnet Disallowed
Useful Threads
================================
www.firewall.cx/forum/2-basic-concepts/3...e-resource-page.html
The administrator has disabled public write access.

SUBNETTING 6 years 3 months ago #34643

  • JONNY-BOY
  • JONNY-BOY's Avatar
  • Offline
  • New Member
  • Posts: 2
  • Karma: 0
Guys, sorry for the improper wording of the question I posted not too long ago,

"Can someone please tell me the next usable ip address in this address range: 172.20.0.1 - 172.20.31.254?"

I left out a few important points and elements from the question.

I had a subnetting lab problem that I was trying to solve where I had to provide 8000 host addresses from the network 172.20.0.0/16. And as you all know, 8000 host addresses will be taken from the third octet with subnet mask of 255.255.224.0 or /19 (172.20.0.0/19) where the total number of host addresses is 8192 and the # of usable host is 8190:

NETWORK | HOST RANGE | BROADCAST
172.20.0.0 | 172.20.0.1 - 172.20.31.254 | 172.20.31.255

Now, If you have to list all the host addresses between 172.20.0.1 and 172.20.31.255, what will be the next address from 172.20.0.1?

That was my QUESTION!!!

I'm a bit confuse as to what is the next address in that range.

SORRY GUYS, I'M NEW TO THIS. I'M STUDY FOR MY CCNA EXAM AND I NEED ALL THE HELP THAT I CAN GET.

THANKS FOR YOUR HELP....
The administrator has disabled public write access.

Re: SUBNETTING 6 years 3 months ago #34646

  • SteveP
  • SteveP's Avatar
  • Offline
  • Distinguished Member
  • Posts: 161
  • Karma: 0
The next after 172.20.0.1 is 172.20.0.2

then 172.20.0.3, 172.20.0.4 ... 172.20.0.254, 172.20.0.255, 172.20.1.0, 172.20.1.1 etc.
The administrator has disabled public write access.

Re: SUBNETTING 6 years 2 months ago #35008

Can someone please tell me the next usable ip address in this address range: 172.20.0.1 - 172.20.31.254?

172.20.32.0/16
The administrator has disabled public write access.
Time to create page: 0.087 seconds

CCENT/CCNA

Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V

Linux

  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup