spfa.t-mobile.com has no NS records.
NS records for this zone are defined at t-mobile.com.
NS records for this zone are defined at t-mobile.com.
Question and response
Question
dig spfa.t-mobile.com. NS
Answer
The response has no answer records.
Authority
t-mobile.com. 300 SOA anppol31.gsm1900.org. admin.t-mobile.com. 3334557015 28800 1800 3600000 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0