Sprint Wireless DNS server not resolving ietf.org

ietf.org and its subdomains such as tools.ietf.org are not accessible
on Sprint 3G/LTE (DNS timeout). From what I gathered this is affecting
Sprint wireless customers nationwide. I created a DNS measurement on
ripe atlas and no signs of other carriers experiencing the same issue.

Emailed Sprint NOC and opened a ticket via support channel, got no
update. Is there someone from Sprint Wireless on this list?

DNS servers
68.28.169.132
68.28.168.132

Thanks.

Yang

ietf.org and its subdomains such as tools.ietf.org are not accessible
on Sprint 3G/LTE (DNS timeout). From what I gathered this is affecting
Sprint wireless customers nationwide. I created a DNS measurement on
ripe atlas and no signs of other carriers experiencing the same issue.

ietf.org has physically diverse secondaries so it strikes me as unlikely
that this problem is outside sprint

ietf.org. 86400 IN NS ns0.amsl.com.
ietf.org. 86400 IN NS ns1.ams1.afilias-nst.info.
ietf.org. 86400 IN NS ns1.mia1.afilias-nst.info.
ietf.org. 86400 IN NS ns1.sea1.afilias-nst.info.
ietf.org. 86400 IN NS ns1.hkg1.afilias-nst.info.
ietf.org. 86400 IN NS ns1.yyz1.afilias-nst.info.