'Whois" connected to my network

[Jim]

# netstat -vat

tcp        0      0 172.16.1.33:41836           
adsl-76-241-133-81.ds:30661 ESTABLISHED


# whois 76.241.133.81
[Querying whois.arin.net]
[whois.arin.net]
AT&T Internet Services SBCIS-SBIS-6BLK (NET-76-192-0-0-1)
                                  76.192.0.0 - 76.255.255.255
se4.bcvloh PPPoX SBC-76-241-128-0-20-0707094338 (NET-76-241-128-0-1)
                                  76.241.128.0 - 76.241.143.255

# ARIN WHOIS database, last updated 2008-12-12 19:10
# Enter ? for additional hints on searching ARIN's WHOIS database.
[root at x86_64 mickey]# netstat -vat
Active Internet connections (servers and established)



AT&T/SBC is my Internet provider, but why would they have a ESTABLISHED 
connection to my network.