No Problems here..
From a to f all according:
$ dig NS swisscom.ch @f.nic.ch.
; <<>> DiG 9.5.1-P3 <<>> NS swisscom.ch @f.nic.ch. ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6710 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 0
Mit freundlichen GrĂ¼ssen
Benoit Panizzon