How to quikly find AS number of a IP address

 

1.using a Whoise server get some infomation about this IP.

eg.  63.160.0.1

From the URL: http://www.iana.org/ipaddress/ip-addresses.htm

I select the URL:  http://www.iana.org
If you can't judge the best Whois server,using trace tool to find out.

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Sprint SPRN-BLKS (NET-63-160-0-0-1)
                                  63.160.0.0 - 63.175.255.255
Maryville Data Systems dba Maryville Technologies SPRINTLINK (NET-63-160-0-0-2)
                                  63.160.0.0 - 63.160.0.255

# ARIN WHOIS database, last updated 2006-01-09 19:10
# Enter ? for additional hints on searching ARIN's WHOIS database.

# ARIN WHOIS database, last updated 2005-12-31 19:10
# Enter ? for additional hints on searching ARIN's WHOIS database.

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2.Find an keywod from the IP info ,then using google search it.

the keyword is PRINTLINK and AS

then you can find the URL at the first Homepage of Google search result!

http://fixedorbit.com/AS/1/AS1239.htm

3.Get more infomation using the URL.

http://www.cidr-report.org/cgi-bin/as-report?as=AS1239

4.Then using the command get DNS
You can guesst it website is WWW.SPRINTLINK.NET
nslookup -type=mx SPRINTLINK.NET

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C:\Documents and Settings\thomas>nslookup -type=mx SPRINTLINK.NET
Server:  dns-chj.sh.cncnet.net
Address:  210.22.70.3

Non-authoritative answer:
SPRINTLINK.NET  MX preference = 0, mail exchanger = kay.SPRINTLINK.NET
SPRINTLINK.NET  MX preference = 0, mail exchanger = jay.SPRINTLINK.NET

SPRINTLINK.NET  nameserver = ns3-auth.SPRINTLINK.NET
SPRINTLINK.NET  nameserver = ns1-auth.SPRINTLINK.NET
SPRINTLINK.NET  nameserver = ns2-auth.SPRINTLINK.NET
jay.SPRINTLINK.NET      internet address = 199.0.233.7
kay.SPRINTLINK.NET      internet address = 199.0.233.8
ns1-auth.SPRINTLINK.NET internet address = 206.228.179.10
ns2-auth.SPRINTLINK.NET internet address = 144.228.254.10
ns3-auth.SPRINTLINK.NET internet address = 144.228.255.10
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5.Then you can discover the topology of the AS system.

6.If using VisualRouter ,you can save more time because it provide Whoisa lookup!

eg.  http://www.linkwan.com/vrhk/

7.The quickly way is use the URL
http://fixedorbit.com/search.htm