"How do I find out my ISP's ip address?"
The problem with the question is
from what perspective do we evaluate what is meant by 'the ISP?'
- my gateway to the ISP? (which is my view of the ISP)
- the DNS addresses by the ISP?
- or the ISP's connection to the Internet (ie their input)?
Leeky makes a good point: "The IP has registered these blocks of IP addresses".
Without much effort, you can use TRACERT GOOGLE.COM to find a path from you
(when at home or at school) to the google website. This will have some information that will allow you find some answers
First, verify you known a valid address for google.com using
nslookup google.com
Code:
nslookup google.com.
Server: nscl-01.tierzero.net << the DNS used to find google.com
Address: 216.116.96.2
Non-authoritative answer:
Name: [B]google.com[/B]
Addresses: 74.125.224.208, 74.125.224.209,
74.125.224.210, [B]74.125.224.211[/B], 74.125.224.212
now - - here's mine example of tracert:
Code:
Tracing route to google.com[B] [74.125.224.211][/B]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms localrouter [192.168.0.1]
2 20 ms 39 ms 13 ms cpe-50-113-112-1.san.res.rr.com [[COLOR="Blue"]50.113.112.1[/COLOR]]
3 9 ms 9 ms 9 ms 76.167.22.185
4 18 ms 21 ms 23 ms tge2-2-0.vnnyca2-rtr1.socal.rr.com [72.129.13.96]
5 22 ms 23 ms 23 ms 72.129.13.0
6 11 ms 13 ms 12 ms ae-5-0.cr0.lax00.tbone.rr.com [66.109.6.102]
7 14 ms 12 ms 12 ms ae-0-0.pr0.lax10.tbone.rr.com [66.109.6.133]
8 14 ms 40 ms 13 ms 72.14.198.73
9 13 ms 12 ms 13 ms 216.239.46.40
10 14 ms 11 ms 12 ms 72.14.236.13
11 12 ms 13 ms 14 ms lax02s02-in-f19.1e100.net [B][74.125.224.211][/B]
Trace complete.
- Line 1 is always your router
- Line 2 is your gateway address as announced by DHCP (also seen in ipconfig /all)
- the last line should be google.com as seen above by nslookup
my gateway address is line 2 = =
50.113.112.1
Using that IP address, we can discover the block of addresses as described by Leeky using a tool like
Win32WhoiS which reports a ton of stuff including
Code:
NetRange: [COLOR="Blue"]50.113.0.0 - 50.113.255.255[/COLOR]
CIDR: [COLOR="Blue"] 50.113.0.0/16[/COLOR]
OriginAS: AS11955, AS20001, AS21522
NetName: RRWE
NetHandle: NET-50-113-0-0-1
[U]OrgName: Road Runner HoldCo LLC[/U]
OrgId: RRWE
Address: 13820 Sunrise Valley Drive
City: Herndon
StateProv: VA
PostalCode: 20171
Road Runner owns the block
50.113.0.0 - 50.113.255.255
Now here's a suprise when we ask what is line 3?
76.167.22.185
Code:
[COLOR="Blue"]NetRange: 76.166.0.0 - 76.167.255.255
CIDR: 76.166.0.0/15[/COLOR]
OriginAS:
NetName: RRACI
NetHandle: NET-76-166-0-0-1
[U]OrgName: Road Runner HoldCo LLC[/U]
OrgId: RRWE
Address: 13820 Sunrise Valley Drive
City: Herndon
StateProv: VA
PostalCode: 20171
Road Runner also owns
76.166.0.0 - 76.167.255.255
In fact, continuing down the list, lines 2-5 are
all Road Runner
which demonstrates the admin's choice to control bandwidth and routing while
within Road Runner and line 8 is Google.
Code:
NetRange: 72.14.192.0 - 72.14.255.255
CIDR: 72.14.192.0/18
OriginAS:
NetName: GOOGLE
NetHandle: NET-72-14-192-0-1
[U]OrgName: Google Inc.[/U]
OrgId: GOGL
Address: 1600 Amphitheatre Parkway
City: Mountain View
StateProv: CA
PostalCode: 94043