I only checked venera.isi.edu for pima.az.us. Here is what I got:
owlman.academ.com% dig @venera.isi.edu pima.az.us ns
; <<>> DiG 8.1 <<>> @venera.isi.edu pima.az.us ns
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;; pima.az.us, type = NS, class = IN
;; AUTHORITY SECTION:
az.us. 1D IN SOA VENERA.ISI.EDU. us-domain.ISI.EDU. (
981221 ; serial
12H ; refresh
1H ; retry
2W ; expiry
1D ) ; minimum
;; Total query time: 374 msec
;; FROM: owlman.academ.com to SERVER: venera.isi.edu 128.9.176.32
;; WHEN: Tue Dec 29 16:29:55 1998
;; MSG SIZE sent: 28 rcvd: 93
Checking the US-Domain list of delegates, I see that pima.az.us is not
supposed to be delegated. I see that co.pima.az.us is.
academ.com% dig @venera.isi.edu co.pima.az.us ns
; <<>> DiG 2.2 <<>> @venera.isi.edu co.pima.az.us ns
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10
;; flags: qr rd ra; Ques: 1, Ans: 2, Auth: 0, Addit: 2
;; QUESTIONS:
;; co.pima.az.us, type = NS, class = IN
;; ANSWERS:
co.pima.az.us. 604800 NS ns.co.pima.az.us.
co.pima.az.us. 604800 NS tophat.co.pima.az.us.
;; ADDITIONAL RECORDS:
ns.co.pima.az.us. 604800 A 159.233.1.2
tophat.co.pima.az.us. 604800 A 159.233.1.1
;; Total query time: 168 msec
;; FROM: academ.com to SERVER: venera.isi.edu 128.9.176.32
;; WHEN: Tue Dec 29 17:38:40 1998
;; MSG SIZE sent: 31 rcvd: 101