IPcalc

IPcalc - the IP address calculator

Network professionals often configure IP addresses for various equipment. While the individual calculations are fairly simple - mostly bit masks - it’s easy to make mistakes. The consequences of mistakes can be disastrous; machines won’t connect with others, or worse, could isolate a whole section of the ‘net (as a misconfigured router might do).

Even when calculating the IDs and masks correctly, it’s tedious.

To the rescue! IPcalc now calculates all those ugly little numbers - quickly and accurately.

Ok - enough marketing hype. Just what does IPcalc do?

IPcalc features:

converts decimal IP addresses to hex

displays bit usage - which bits are network, host, or subnet bits

Class-based masks and IDs

subnet masks and IDs

CIDR masks and IDs

Subnets - display the address range for each subnet

Given an IP address, displays the masks and IDs for networks, subnets, and the host.

identifies invalid host addresses for a particular subnet (where the host bits are all zeros or ones)

Download version 1.02 (14k) released 31Mar 2002

(Or see below for registration information)

Useful URLs

Boardwatch Magazine http://www.ispworld.com
(now owned by ISP World magazine)

Many of the ISP Tech Talk columns deal with routers and networking
issues. Several especially useful columns are:
ISP Tech Talk column: "Your Own Address Space"
http://www.ispworld.com/archive/mag/97/apr/bwm46.html
@Internet column: "How Hard is CIDR"
http://www.ispworld.com/archive /mag/97/jun/bwm47.html

CIDR FAQ
http://www.ibm.net.il/~hank/cidr.html

3Com - "Understanding IP Addressing: Everything You Ever Wanted to Know"
http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf

Sangoma Technologies - TCP/IP and IPX Routing Tutorial
http://www.incoma.ru/protocols/tcp_ip.html

Registration details:

When you register, you'll receive a registration code which will disable the nag screens. You will also receive all future versions of IPcalc for free. (registration is for lifetime)

	IPcalc registration fee:	$10 (US dollars)
	payment methods:	PalmGear or Check (via snailmail)

		my "store" at eSellerate

PalmGear - use your credit card on their secure web server and simply buy IPcalc.
Go to their main web page at http://www.palmgear.com or to jump directly to the IPcalc purchase page click the above "buy it" button, and click the "Add To Cart" button on PalmGear's IPcalc page.
While you're there, check out some of the other great software, hardware, and accessories!

eSellerate - I set up a store at eSellerate; through this store I can take credit cards. (I don't get your credit card info; they only tell me about the purchases.)

Snailmail - If you want to register by mail, you can send a check or money order to:

Alan Weiner
1409 Great Plain Avenue
Needham, MA 02492

Please send your email address too, so I can send you a confirmation of receipt and the registration code. (if you don't have an email address, please send a snail-mail address so I can send it to you.)

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