Linkwalker and BDFetch

What is BDFetch doing spidering your website?

Noticing that Linkwalker requests robots.txt and is followed by BDFetch.

Example of the Linkwalker robot:

72.14.164.165 - - "GET /robots.txt HTTP/1.1" 406 1326 "www.seventwentyfour.com/" "LinkWalker/2.0"

Examples of the BDFetch robot:

72.14.164.177 - - "GET /robots.txt HTTP/1.1" 5816 "www.brandimensions.com" "BDFetch"
72.14.164.193 - - "GET /index.html HTTP/1.1" 5816 "www.brandimensions.com" "BDFetch"
72.14.164.173 - - "GET /robots.txt HTTP/1.1" 5816 "www.brandimensions.com" "BDFetch"
72.14.164.191 - - "GET /index.html HTTP/1.1" 5816 "www.brandimensions.com" "BDFetch"
72.14.164.177 - - "GET /robots.txt HTTP/1.1" 5816 "www.brandimensions.com" "BDFetch"
72.14.164.188 - - "GET /index.html HTTP/1.1" 5816 "www.brandimensions.com" "BDFetch"

Solution to bandwidth gobbling bots in this IP range:

Add these to the deny list on the router.
72.14.163.0/24
72.14.164.0/24

Are there other user-agents for BDFetch in the wild?