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Infoseek-GO Spider Codes Debunked

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by Dirk Brockhausen

Many Infoseek spiders originate from hosts that seem to bear a cryptic string of characters in their domain names, e.g. cca26101.infoseek.com, cca26111.infoseek.com, cca261e7.infoseek.com, etc.

While this may seem somewhat weird at first glance, there is an underlying logic to it which can be discerned when viewing the third level domain in context with their original IP.

Let's review this using the following entry pair as a practical example:

cca26101.infoseek.com - 204.162.97.1

The string "cca26101" is made up of 8 (i.e. 4 x 2) characters:

cc|a2|61|01.

These twin characters can be converted to integers. Note that to do this we will not be working the decimal system here but, rather, the hexadecimal system which is based on 16. Within this system, the following assignments hold true:

0 : 0 1 : 1 2 : 2 3 : 3 4 : 4 5 : 5 6 : 6 7 : 7 8 : 8 9 : 9 a : 10 b : 11 c : 12 d : 13 e : 14 f : 15

Based on this table, we can convert the twin characters easily as follows:

cc : 12 x 16 + 12 = 192 + 12 = 204 a2 : 10 x 16 + 2 = 160 + 2 = 162 61 : 6 x 16 + 1 = 96 + 1 = 97 01 : 0 x 16 + 1 = 0 + 1 = 1

The base being 16, it is with 16 that the values have to be multiplied.

Merging these results, we obtain:

204.162.97.1

This is identical with the IP of cca26101.infoseek.com.

Let's take two more examples to illustrate that we are not dealing with mere numerological coincidence here.

cca261e7.infoseek.com - 204.162.97.231

cc : 12 x 16 + 12 = 192 + 12 = 204 a2 : 10 x 16 + 2 = 160 + 2 = 162 61 : 6 x 16 + 1 = 96 + 1 = 97 e7 : 14 x 16 + 7 = 224 + 7 = 231

Result: 204.162.97.231.

cde2ccee.infoseek.com 205.226.204.238

cd : 12 x 16 + 13 = 192 + 13 = 205 e2 : 14 x 16 + 2 = 224 + 2 = 226 cc : 12 x 16 + 12 = 192 + 12 = 204 ee : 14 x 16 + 14 = 224 + 14 = 238

Result: 205.226.204.238

The lowest value would be 00000000.infoseek.com, the highest ffffffff.infoseek.com.

This equates to IPs 0.0.0.0 and 255.255.255.255 respectively - which are, of course, the limits of any IP range.

Thus, what may seem like utter nonsense to the uneducated eye, is shown to be a sequence of 4 integer blocks representing the spider's IP address.

Dirk Brockhausen is the co-founder and principal of fantomaster.com Ltd. (UK) and fantomaster.com GmbH (Belgium), a company specializing in webmasters software development, industrial-strength cloaking and search engine positioning services. He holds a doctorate in physics and has worked as an SAP consultant and software developer since 1994. He is also Technical Editor of fantomNews, a free newsletter focusing on search engine optimization, available at: < http://fantomaster.com/fantomnews-sub.html > You can contact him at mailto:fntecheditor@fantomaster.com (c) copyright 2000 by fantomaster.com

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