Code:
# nslookup -qt=MX -d2 fax-failures@smithssc.com
traceroute mail.so.centurytel.net;; res_nmkquery(QUERY, 250.182.142.209.in-addr.arpa, IN, PTR)
------------
SendRequest(), len 46
HEADER:
opcode = QUERY, id = 14568, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
250.182.142.209.in-addr.arpa, type = PTR, class = IN
------------
------------
Got answer (166 bytes):
HEADER:
opcode = QUERY, id = 14568, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 2, additional = 2
QUESTIONS:
250.182.142.209.in-addr.arpa, type = PTR, class = IN
ANSWERS:
-> 250.182.142.209.in-addr.arpa
type = PTR, class = IN, dlen = 29
name = dnsc1-vp.la.centurylink.net
ttl = 456310 (5d6h45m10s)
AUTHORITY RECORDS:
-> 182.142.209.in-addr.arpa
type = NS, class = IN, dlen = 17
nameserver = ns2.centurytel.net
ttl = 549109 (6d8h31m49s)
-> 182.142.209.in-addr.arpa
type = NS, class = IN, dlen = 6
nameserver = ns1.centurytel.net
ttl = 549109 (6d8h31m49s)
ADDITIONAL RECORDS:
-> ns1.centurytel.net
type = A, class = IN, dlen = 4
internet address = 209.142.136.142
ttl = 74812 (20h46m52s)
-> ns2.centurytel.net
type = A, class = IN, dlen = 4
internet address = 207.230.192.252
ttl = 71572 (19h52m52s)
------------
Server: dnsc1-vp.la.centurylink.net
Address: 209.142.182.250
;; res_nmkquery(QUERY, fax-failures@smithssc.com, IN, MX)
------------
SendRequest(), len 43
HEADER:
opcode = QUERY, id = 14569, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
fax-failures\@smithssc.com, type = MX, class = IN
------------
------------
Got answer (116 bytes):
HEADER:
opcode = QUERY, id = 14569, rcode = NXDOMAIN
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
fax-failures\@smithssc.com, type = MX, class = IN
AUTHORITY RECORDS:
-> com
type = SOA, class = IN, dlen = 61
ttl = 900 (15M)
origin = a.gtld-servers.net
mail addr = nstld.verisign-grs.com
serial = 1309551888
refresh = 1800 (30M)
retry = 900 (15M)
expire = 604800 (1W)
minimum ttl = 86400 (1D)
------------
;; res_nmkquery(QUERY, fax-failures@smithssc.com., IN, MX)
------------
SendRequest(), len 43
HEADER:
opcode = QUERY, id = 14570, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
fax-failures\@smithssc.com, type = MX, class = IN
------------
------------
Got answer (116 bytes):
HEADER:
opcode = QUERY, id = 14570, rcode = NXDOMAIN
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
fax-failures\@smithssc.com, type = MX, class = IN
AUTHORITY RECORDS:
-> com
type = SOA, class = IN, dlen = 61
ttl = 900 (15M)
origin = a.gtld-servers.net
mail addr = nstld.verisign-grs.com
serial = 1309551888
refresh = 1800 (30M)
retry = 900 (15M)
expire = 604800 (1W)
minimum ttl = 86400 (1D)
------------
*** dnsc1-vp.la.centurylink.net can't find fax-failures@smithssc.com: Non-existent host/domain