How to increase the internal IP address

No _direct_ way. IP address space (in IP v4) is limited, no way around that.

However this problem is often solved indirectly.
Real, outside-visible, IP adresses _everywhere_ were often the only viable things a few years back also for internal company sites, if only some of the nodes actually needed to be visible from the outside.
However now with NAT things can be more efficient. Take the following steps:
* Use an internal range (class A B or C - doesn't matter) for all workstations andservers. Say we take a class B range.
* Shield everything from the Internet through NAT functionality, probably situated inside some perimeter (De Militarised Zone)
Note that through NAT, hundreds of internal nodes (mostly workstations) can appearto the outside Internet as ALL sharing ONE (Class C) address. The NAT server will 'multiplex' and also de-multiplex the return traffic from the Internet.
* Solely for those hosts that DO need access from external users, give them aliases inside your old Class C range. The NAT function will map the aliases to the internal Class B range.

Hope this helps.

- The Netherlands

Hi
these are the Allowed Class C Subnet and Host IP addresses.

#bits Subnet Mask CIDR #Subnets #Hosts Nets*Hosts
2 255.255.255.192 /26 2 62 124
3 255.255.255.224 /27 6 30 180
4 255.255.255.240 /28 14 14 196
5 255.255.255.248 /29 30 6 180
6 255.255.255.252 /30 62 2 124

please visit this site for more info:

Address Allocation for Private Internets
http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc1918.html

Good luck

Mohamed
***Very Important NOTE *********
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I would just change your subnet mask from .224 to .192. This will increase the number of hosts available from 30 to 62. The one drawback is having to change the subnet mask on all of the machines. I hope my approach isn't too simplistic.

Change the subnet to 255.255.255.0 and get all 254 IP addresses.

Use an internal A-class network of 10.0.0.0 (designated as a private network). Use a firewall with one "official" external address to hide and translate your internal addresses via NAT. There are software solutions for a firewall on Nt, but I persanlly prefer either a small dedicated Linux-Box with two NIC or a dedicated hardware (check linksys.com).

Are you running them behind a firewall? If so just change the netmask. If they are in front of it you will have to get more from the agency where you got the originals. And if you bought them you likely will have to get a different series becausethe rest of your network addresses have likely been issued long ago.

Why not use the Subnet Mask of [255.255.255.0] this will give room for up to 253 IP addresss range.

Goodluck!