Sabu has been linked to the domain prvt.org. Here is an excerpt of a widely-published doc:
7.) Sabu : Lulzsec Leader
Dox:
Name: Hector Xavier Montsegur
Location: New York, New York
Race: Puerto Rican ?
E-Mail: sabu@prvt.org
Computer:
Handles: 548U, hectic_les, leon
IP: 199.68.198.129 (ssh-only.recklesstheory.com)
Profiles:
http://www.facebook.com/lesmujahideen ?
Sites:
prvt.org
Source: http://www.thehackernews.com/2011/06/lulzsec-jester-expose-each-other-long.html
Today th3j35t3r tweeted this:
"@th3j35t3r: Here's the thing SABU's personal domain 'PRVT.ORG' expired & auto-renewed yesterday, privacy option didn't. - http://t.co/fDZIrtw #tangodown"
I tried an online whois page, and it indeed seems to reveal an address for Sabu.Here are images of what I found:
Edited at 12:48 pm 6:26 pm to fix curly quotes around the tweet.