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Ben Gillam
Asked: 2013-07-26 05:03:42 +0800 CST

IP Address shortage/Subnetting

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Facing a problem where we are running out of available network addreses, we are currently on bog standard 192.168.1.x range.

Reading about making more ips available and subnets and think i have just about got my head around it.

My question is, is it as simple as saying to my router (currently handling dhcp) use ip range 172.16.0.1 / 255.255.254.0 and it should hand out ips from 172.16.0.1 to 172.16.1.255? all of which are able to talk to each other?

Or have i got wrong end of stick here? On basis of above is there a way of staying on 192.168.x.x and getting more hosts, we are currently using too many but expansion plans wont see more than another 100 at most in next 5 years.

if you need any more detail please let me know.

Thanks

networking

2 Answers

  1. Best Answer

    RFC 1918 identifies a number of private address ranges, including 192.168.0.0/16. This block includes all addresses from 192.168.0.0 to 192.168.255.255, which ought to be sufficient for your network.

    You're currently using 192.168.1.0/24, which is a block of 254 addresses. If you subtract a bit from the network mask -- 192.168.0.0/23 -- you'll double your available addresses. Your range will extend from 192.168.0.0 to 192.168.1.255. That corresponds to a "netmask" of 255.255.254.0.

    You'll get the same thing using 172.16.0.0/23, which is what you've identified in your question. Same number of addresses, just a different range of numbers. Note that according to RFC 1918 that block is bigger; 172.16.0.0/12 includes over 1,000,000 addresses.

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  2. You could migrate from 192.168.1.0/24 to 192.168.0.0/23. 

    min ip will be: 192.168.0.1
max ip will be: 192.168.1.254

    With such subnet there are 510 hosts will be available

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