Tsk tsk. Slap Google.
It turns out, the correct site is sitemaps.org. (notice the s, plural ). The interesting thing is that the fake site is registered using Google's address and phone number.
Here's analysis from Rob Shinn:
UPDATE: sitemap.org is just a squatter, I think. The site is actually sitemaps.org, but Google's information was used to register the domain sitemap.org. Again, see https://plus.google.com/u/0/112757647855302148298/posts/VfVPuqxcQVv (+Xah Lee's original post) for my original DNS analysis.
Looks like the DNS got taken over. $ whois sitemap.org [Querying whois.publicinterestregistry.net] [whois.publicinterestregistry.net] -snip- Domain ID:D87779784-LROR Domain Name:SITEMAP.ORG Created On:22-Jun-2002 16:47:27 UTC Last Updated On: *21-May-2012 09:22:08 UTC* Expiration Date:22-Jun-2013 16:47:27 UTC Sponsoring Registrar:MarkMonitor Inc. (R37-LROR) Status:CLIENT DELETE PROHIBITED Status:CLIENT TRANSFER PROHIBITED Status:CLIENT UPDATE PROHIBITED Registrant ID:mmr-32097 Registrant Name:DNS Admin Registrant Organization:Google Inc. Registrant Street1:1600 Amphitheatre Parkway Registrant Street2: Registrant Street3: Registrant City:Mountain View Registrant State/Province:CA Registrant Postal Code:94043 Registrant Country:US Registrant Phone:+1.6506234000 Registrant Phone Ext.: Registrant FAX:+1.6506188571 Registrant FAX Ext.: Registrant Email:dns-admin@google.com Admin ID:mmr-32097 Admin Name:DNS Admin Admin Organization:Google Inc. Admin Street1:1600 Amphitheatre Parkway Admin Street2: Admin Street3: Admin City:Mountain View Admin State/Province:CA Admin Postal Code:94043 Admin Country:US Admin Phone:+1.6506234000 Admin Phone Ext.: Admin FAX:+1.6506188571 Admin FAX Ext.: Admin Email:dns-admin@google.com Tech ID:mmr-32097 Tech Name:DNS Admin Tech Organization:Google Inc. Tech Street1:1600 Amphitheatre Parkway Tech Street2: Tech Street3: Tech City:Mountain View Tech State/Province:CA Tech Postal Code:94043 Tech Country:US Tech Phone:+1.6506234000 Tech Phone Ext.: Tech FAX:+1.6506188571 Tech FAX Ext.: Tech Email:dns-admin@google.com Name Server: NS2.TERA-BYTE.COM Name Server: NS1.TERA-BYTE.COM Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: DNSSEC:Unsigned $ nslookup sitemap.org Server: 127.0.0.1 Address: 127.0.0.1#53 Non-authoritative answer: Name: sitemap.org Address: 216.194.68.49 $ whois 216.194.68.49 [Querying whois.arin.net] [Redirected to rwhois.tera-byte.com:4321] [Querying rwhois.tera-byte.com] [rwhois.tera-byte.com] %rwhois V-1.5:003fff:00 rwhois.tera-byte.com (by Network Solutions, Inc. V-1.5.9.6) network:Class-Name:network network:Auth-Area:216.194.64.0/19 network:Network-Name:NET-216-194-68-1 network:IP-Network:216.194.68.1/24 network:Name;I:Tera-Byte Dot Com Inc. network:Address-1;I:Terminal Level, 10004-104 Ave network:Address-2;I:Edmonton, AB T5J0K1 network:Address-3;I:CA network:Contact;I:hostmaster@tera-byte.com $ nslookup sitemap.org 8.8.8.8 Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: sitemap.org Address: 216.194.68.49 $ nslookup sitemap.org 8.8.4.4 Server: 8.8.4.4 Address: 8.8.4.4#53 Non-authoritative answer: Name: sitemap.org Address: 216.194.68.49