host81-148-91-131.in-addr.btopenworld.com is the identity behind a number of hits to my site, but what is weird about them is that in the logs they present themselves as Googlebot!

81.148.91.131 - - [26/Jul/2009:15:23:12 +0100] "GET /thingywotsityeah.html HTTP/1.1" 200 151 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; http://www.google.com/bot.html)"
So what I'm curious about is whether in fact this is really Googlebot after all, using BT openworld as their ISP...

I've just never ever seen it before, I believe - so my guess is that it's not Googlebot but someone else who's set their crawler or browsing system to masquerade as googlebot.

Does anyone know if I'm wrong?

Here, of course, is the whois identity...

whois 81.148.91.131
[Querying whois.ripe.net]
[whois.ripe.net]
% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See http://www.ripe.net/db/support/db-terms-conditions.pdf

% Note: This output has been filtered.
% To receive output for a database update, use the "-B" flag.

% Information related to '81.148.72.0 - 81.148.95.255'

inetnum: 81.148.72.0 - 81.148.95.255
remarks: *******************************************************
remarks: * Please send abuse reports to abuse@btopenworld.com *
remarks: *******************************************************
netname: BT-ADSL
descr: IP pools
country: GB
admin-c: BTOW1-RIPE
tech-c: BTOW1-RIPE
status: ASSIGNED PA
mnt-by: BTNET-MNT
mnt-lower: BTNET-MNT
mnt-routes: BTNET-MNT
source: RIPE # Filtered

role: BT OPENWORLD OPERATIONAL SUPPORT
address: BT
address: Openworld
address: UK
abuse-mailbox: abuse@btopenworld.com
admin-c: NPT14-RIPE
tech-c: DY128-RIPE
nic-hdl: BTOW1-RIPE
mnt-by: BTNET-MNT
source: RIPE # Filtered

% Information related to '81.128.0.0/11AS2856'

route: 81.128.0.0/11
descr: BT Public Internet Service
origin: AS2856
mnt-by: BTNET-MNT
source: RIPE # Filtered