Folks,
I received my first host unknown (550 <foo@bis.esl.com>... Host unknown)
error message in the mail the other day as a result of my monthly
mailings. Is there anything other than nslookup(8C) and dig(1) that I
can use to verify whether or not this domain is really defunct?
Here is my use of nslookup(8C) and dig(1):
------------------------------
nslookup(8C)
------------------------------
coral:~/tmp% nslookup
Default Server: mongoose.cs.unm.edu
Address: 198.59.151.1
> set q=any
> bis.esl.com
Server: mongoose.cs.unm.edu
Address: 198.59.151.1
*** mongoose.cs.unm.edu can't find bis.esl.com: Non-existent domain
> esl.com
Server: mongoose.cs.unm.edu
Address: 198.59.151.1
*** mongoose.cs.unm.edu can't find esl.com: Non-existent domain
> exit
coral:~/tmp%
------------------------------
dig(1)
------------------------------
coral:~/tmp% dig -t any bis.esl.com
; <<>> DiG 2.0 <<>> -t bis.esl.com
;; ->>HEADER<<- opcode: QUERY , status: NXDOMAIN, id: 6
;; flags: qr aa rd ra ; Ques: 1, Ans: 0, Auth: 1, Addit: 0
;; QUESTIONS:
;; bis.esl.com, type = ANY, class = IN
;; AUTHORITY RECORDS:
COM. 86400 SOA NS.INTERNIC.NET. HOSTMASTER.INTERNIC.NET. (
1995022700 ;serial
10800 ;refresh
900 ;retry
604800 ;expire
86400 ) ;minim
;; Sent 1 pkts, answer found in time: 74 msec
;; FROM: coral to SERVER: default -- 198.59.151.1
;; WHEN: Tue Feb 28 09:27:46 1995
;; MSG SIZE sent: 29 rcvd: 94
coral:~/tmp% dig -t any esl.com
; <<>> DiG 2.0 <<>> -t esl.com
;; ->>HEADER<<- opcode: QUERY , status: NXDOMAIN, id: 6
;; flags: qr aa rd ra ; Ques: 1, Ans: 0, Auth: 1, Addit: 0
;; QUESTIONS:
;; esl.com, type = ANY, class = IN
;; AUTHORITY RECORDS:
COM. 86400 SOA NS.INTERNIC.NET. HOSTMASTER.INTERNIC.NET. (
1995022700 ;serial
10800 ;refresh
900 ;retry
604800 ;expire
86400 ) ;minim
;; Sent 1 pkts, answer found in time: 74 msec
;; FROM: coral to SERVER: default -- 198.59.151.1
;; WHEN: Tue Feb 28 09:28:49 1995
;; MSG SIZE sent: 25 rcvd: 90
coral:~/tmp%
------------------------------
Thanks very much,
Eric De Mund <ead@netcom.com>
List Owner: Bay Area Bookstore Events
http://www.culturewave.com/~culturew/ba-bookstore-events/
ftp://wwa.com/pub/culturewave/ba-bookstore-events/
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