You can't make a (legitimate) PTR for an ip address you do not control the reverse zone for. It would "work" if your resolver was configured to use the actual route 53 server (your NS records) for name resolution, but I doubt seriously those servers will allow recursive queries (I hope not). You need to ask the person responsible for that address's in-addr.arpa zone to create the PTR for you.
You can find this out with dig easily, though you may have to remove octets until you get an answer. This is for everything within 52.7, owned by AWS:
$ dig 7.52.in-addr.arpa ns
; <<>> DiG 9.9.5-4.3ubuntu0.2-Ubuntu <<>> 7.52.in-addr.arpa ns
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40013
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;7.52.in-addr.arpa. IN NS
;; ANSWER SECTION:
7.52.in-addr.arpa. 899 IN NS pdns1.ultradns.net.
7.52.in-addr.arpa. 899 IN NS x2.amazonaws.com.
7.52.in-addr.arpa. 899 IN NS x4.amazonaws.org.
7.52.in-addr.arpa. 899 IN NS x1.amazonaws.com.
7.52.in-addr.arpa. 899 IN NS x3.amazonaws.org.
;; Query time: 71 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Thu May 07 14:26:50 CDT 2015
;; MSG SIZE rcvd: 172
If the output is unclear about ownership, you can try the SOA record for the zone:
$ dig +short 7.52.in-addr.arpa soa
dns-external-master.amazon.com. root.amazon.com. 1033 3600 900 604800 900
The email address is firstname.lastname@example.org.
It is unlikely anyone follows these rules anymore, though.