The response is correct, since this IP (edit) is not found on the internet and cannot be resolved to a domain name:
dig -x 159.203.95.226
; <<>> DiG 9.11.5-P4-5.1-Raspbian <<>> -x 159.203.95.226
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 14221
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;226.95.203.159.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
95.203.159.in-addr.arpa. 3600 IN SOA ns1.digitalocean.com. hostmaster.95.203.159.in-addr.arpa. 1588703067 10800 3600 604800 1800
;; Query time: 967 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sat May 09 12:19:25 CDT 2020
;; MSG SIZE rcvd: 123