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What is an IP
address or
email domain address?
IP address
are numeric numbers (example:
151.196.75.10
and not
mydomain.com) that represents a location on the internet,
most web site
has a domain name (ie: mydomain.com) linked to
an IP address that emails can be sent to.
IP addresses are
allocated to companies and ISPs in blocks. Anyone can find out who
administers a block of addresses or the owner of a domain address by using an IP Block
whois tool to query the Internic database.
See:
IP,
DNS Address
DNS (Domain Name System) is a distributed domain
based naming system database that can be query to identify administers of
IP address--a string of numbers, ie:
207.151.159.3 are translated into a
string of "letters" called Domain Name
- example:
IP address 207.151.159.3
Domain Name
www.internic.net
By using a DNS
Program query tool (freeware from samspade.org) users can access a DNS Name Server on the Internet and
gather data in its DNS database.
Notes:
The DNS server IP
Address has
nothing to do with the process of email message delivery. It merely serves to
turn the
IP
address--a series of four 8
bit numbers, ie: 151.196.75.10 into www.mysite.com - (a domain name) that's
all.
Example of queries on a DNS Server to identify
and get relevant data and records for: gatech.edu
gatech.edu = 130.207.244.244
-
Domain Name (primary search key)
-
Time to Live (in seconds, up to one day)
-
Type (of info in the value field)
A - IP address
NS - Name Server for this domain
MX - Mail Exchange, where to send mail
CName an alias for receiving mail
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Class - IN for Internet info
-
Value - data that depends on Type (A->IP Addr.)
$
nslookup 199.77.146.56
Server: eagle.gcatt.gatech.edu
Address: 199.77.146.19
Name: johnmac.gcatt.gatech.edu
Address: 199.77.146.56
$ nslookup johnmac.gcatt.gatech.edu
Server: eagle.gcatt.gatech.edu
Address: 199.77.146.19
Name: johnmac.gcatt.gatech.edu
Address: 199.77.146.56
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feed-back or suggestions? Please
