spf-a.twcable.com has no NS records.
NS records for this zone are defined at twcable.com.
NS records for this zone are defined at twcable.com.
Question and response
Question
dig spf-a.twcable.com. NS
Answer
The response has no answer records.
Authority
twcable.com. 3600 SOA ns1.twcable.com. hostmaster.pblpdns01.twcable.com. 2026012003 14400 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0