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Stealth crawler out of Cogent / PSINet



11:41 pm on Mar 2, 2014 (gmt 0)

Hi all,

Wondering if anyone has seen this irritating fellow.

Since I started blocking any "Java/1.?.?_?" User-Agent, I saw a lot of requests blocked from (apparently assigned to PSINet, Inc. by Cogent Communications?)

So I blocked that IP, and saw a rapid string of requests being blocked, with a mix of Java User-Agents (1.6.0_26, 1.6.0_29, 1.6.0_30) and fake Safari User-Agent "Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/533.3 (KHTML, like Gecko) Qt/4.7.1 Safari/533.3". Also a few with just "Mozilla/5.0".

Was wondering if anyone else had come across this? Project Honeypot has a few comments about crawling from there dating back to October 2012.


1:13 am on Mar 3, 2014 (gmt 0)

WebmasterWorld Senior Member wilderness is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

One of the standard terms to deny access with the UA is Java.

see this thread at top of forum:

Default User Agents of Programming Libraries and Command Line Tools


3:00 am on Mar 5, 2014 (gmt 0)

Well, indeed, I am denying "Java" UAs, that's how I noticed this IP.

But since blocking the IP, I noticed much, much more traffic was coming from it with a fake browser UA.

I blocked the range after seeing it referred to at [networktools.nl...] - the rwhois shows that range as ICEFROST NOC + +1-877-888-9119, ADMIN@ICEFROST.com

icefrost.com is registered to:

System Administrator
9850 S. Maryland Pkwy. A5-358
Las Vegas, NV 89123
Telephone: 18778783049

All the activity I've seen since blocking has been from and

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