Hi!
I think it means that the R-DNS is not resolveable:
[EMAIL PROTECTED]:~$ ping 53-255-112-92.pool.ukrtel.net
ping: unknown host 53-255-112-92.pool.ukrtel.net
[EMAIL PROTECTED]:~$ dig +trace 53-255-112-92.pool.ukrtel.net
; <<>> DiG 9.5.0-P2 <<>> +trace 53-255-112-92.pool.ukrtel.net
;; global options: printcmd
. 175051 IN NS J.ROOT-SERVERS.NET.
. 175051 IN NS K.ROOT-SERVERS.NET.
. 175051 IN NS L.ROOT-SERVERS.NET.
. 175051 IN NS M.ROOT-SERVERS.NET.
. 175051 IN NS A.ROOT-SERVERS.NET.
. 175051 IN NS B.ROOT-SERVERS.NET.
. 175051 IN NS C.ROOT-SERVERS.NET.
. 175051 IN NS D.ROOT-SERVERS.NET.
. 175051 IN NS E.ROOT-SERVERS.NET.
. 175051 IN NS F.ROOT-SERVERS.NET.
. 175051 IN NS G.ROOT-SERVERS.NET.
. 175051 IN NS H.ROOT-SERVERS.NET.
. 175051 IN NS I.ROOT-SERVERS.NET.
;; Received 384 bytes from 81.3.4.76#53(81.3.4.76) in 21 ms
net. 172800 IN NS M.GTLD-SERVERS.net.
net. 172800 IN NS J.GTLD-SERVERS.net.
net. 172800 IN NS L.GTLD-SERVERS.net.
net. 172800 IN NS I.GTLD-SERVERS.net.
net. 172800 IN NS C.GTLD-SERVERS.net.
net. 172800 IN NS A.GTLD-SERVERS.net.
net. 172800 IN NS G.GTLD-SERVERS.net.
net. 172800 IN NS B.GTLD-SERVERS.net.
net. 172800 IN NS K.GTLD-SERVERS.net.
net. 172800 IN NS E.GTLD-SERVERS.net.
net. 172800 IN NS H.GTLD-SERVERS.net.
net. 172800 IN NS F.GTLD-SERVERS.net.
net. 172800 IN NS D.GTLD-SERVERS.net.
;; Received 504 bytes from 192.112.36.4#53(G.ROOT-SERVERS.NET) in 133 ms
ukrtel.net. 172800 IN NS auth02.ns.uu.net.
ukrtel.net. 172800 IN NS expert.ukrtel.net.
;; Received 127 bytes from 192.26.92.30#53(C.GTLD-SERVERS.net) in 99 ms
pool.ukrtel.net. 86400 IN SOA expert.ukrtel.net.
hostmaster.ukrtel.net. 2008090100 10800 3600 1209600 86400
;; Received 101 bytes from 195.5.6.10#53(expert.ukrtel.net) in 46 ms
[EMAIL PROTECTED]:~$
Viele Gruesse,
Peter
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