Host not found

Unable to find a host corresponding to the IP address 193.82.52.4.
The output of `dig -x '193.82.52.4'` follows:

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> -x 193.82.52.4
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 28768
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;4.52.82.193.in-addr.arpa.	IN	PTR

;; AUTHORITY SECTION:
52.82.193.in-addr.arpa.	86400	IN	SOA	pri1.dns.uk.psi.net. hostmaster.uk.psi.com. 2009010900 28800 1800 2419200 900

;; Query time: 3 msec
;; SERVER: 83.166.160.10#53(83.166.160.10)
;; WHEN: Mon Sep  6 10:28:49 2010
;; MSG SIZE  rcvd: 118