o5.ptr3197.newtonsoftware.com has no NS records.
NS records for this zone are defined at newtonsoftware.com.
NS records for this zone are defined at newtonsoftware.com.
Question and response
Question
dig o5.ptr3197.newtonsoftware.com. NS
Answer
The response has no answer records.
Authority
newtonsoftware.com. 900 SOA ns-1422.awsdns-49.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0