What can I do with Internet host name corresponding to IP address?

In PHP I get the Internet host name corresponding to IP address of my visitor.

I do this with:
gethostbyaddr($_SERVER['REMOTE_ADDR']); //In my case it returns "r2301050.b2b2c.ca"

What can I find out about this host name value (r2301050.b2b2c.ca)? You know, we can find out more about a given IP address, what can we do with an host name? I mean what additionnal information can I get about this host/user?
mychel_normandeauAsked:
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ddrudikConnect With a Mentor Commented:
What do you want to know?

There are various IP tools at:
http://www.iptools.com/

The hostname resolves to:
66.158.132.192

arin.net whois reports:
B2B2C Inc B2B2C-HV-1 (NET-66-158-128-0-1)
                                  66.158.128.0 - 66.158.159.255
CIDC-Internal use CIDCHV-STATIC1 (NET-66-158-132-0-1)
                                  66.158.132.0 - 66.158.133.255

CustName:   CIDC-Internal use
Address:    1575 Henri-Bourassa W.
Address:    Suite #255
City:       Montreal
StateProv:  QC
PostalCode: H3M-3A9
Country:    CA
RegDate:    2002-09-10
Updated:    2002-09-10

NetRange:   66.158.132.0 - 66.158.133.255
CIDR:       66.158.132.0/23
NetName:    CIDCHV-STATIC1
NetHandle:  NET-66-158-132-0-1
Parent:     NET-66-158-128-0-1
NetType:    Reassigned
Comment:    
RegDate:    2002-09-10
Updated:    2002-09-10

OrgAbuseHandle: ABUSE936-ARIN
OrgAbuseName:   Abuse Desk
OrgAbusePhone:  +1-514-908-5420
OrgAbuseEmail:  abuse@b2b2c.ca

OrgTechHandle: ML1216-ARIN
OrgTechName:   Lathoud, Martin
OrgTechPhone:  +1-514-908-5420
OrgTechEmail:  noc@b2b2c.ca

# ARIN WHOIS database, last updated 2008-02-04 19:03
# Enter ? for additional hints on searching ARIN's WHOIS database.
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Rok-KraljCommented:
Name:       Abuse Desk
Handle:     ABUSE936-ARIN
Company:    B2B2C Inc
Address:    1575 Henri-Bourassa ouest bureau 255
City:       Montreal
StateProv:  QC
PostalCode: H3M-3A9
Country:    CA
Comment:
RegDate:    2005-06-27
Updated:    2005-06-27
Phone:      +1-514-908-5420  (Office)
Email:      abuse@b2b2c.ca

# ARIN WHOIS database, last updated 2008-02-04 19:03
# Enter ? for additional hints on searching ARIN's WHOIS database.
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Julian MatzJoint ChairpersonCommented:
www.dnsstuff.com also has some handy tools - e.g. DNS records, DNS reports, Whois, Reverse IP, etc. etc.
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