cannot resolve oppedahl.com from uspto.gov domain

[Lear, Karen (Evolver)]

Beginning sometime within the past few days, uspto.gov domain cannot resolve oppedahl.com domain, but can resolve it from almost everywhere else.  Some free websites (http://centralops.net/co/) cannot resolve it as well.  I want to verify that uspto.gov doesn't need to correct anything on our end.  When doing a dig, I can't get an IP address for their nameservers.

By the way, they have published DNSSEC keys out there not in use.  Last year, I had a few clients that couldn't connect to uspto.gov domain when I had published keys out there that I had not removed.  Once I removed them, the problem was resolved.  Do you think this could be the same case for oppedahl.com?  I appreciate any help.  Thx.

Results of dig +trace:
; <<>> DiG 9.7.4-P1 <<>> +trace oppedahl.com
;; global options: +cmd
.                       46503   IN      NS      h.root-servers.net.
.                       46503   IN      NS      f.root-servers.net.
.                       46503   IN      NS      m.root-servers.net.
.                       46503   IN      NS      e.root-servers.net.
.                       46503   IN      NS      k.root-servers.net.
.                       46503   IN      NS      l.root-servers.net.
.                       46503   IN      NS      d.root-servers.net.
.                       46503   IN      NS      j.root-servers.net.
.                       46503   IN      NS      b.root-servers.net.
.                       46503   IN      NS      c.root-servers.net.
.                       46503   IN      NS      a.root-servers.net.
.                       46503   IN      NS      g.root-servers.net.
.                       46503   IN      NS      i.root-servers.net.
;; Received 512 bytes from 127.0.0.1#53(127.0.0.1) in 41 ms

com.                    172800  IN      NS      a.gtld-servers.net.
com.                    172800  IN      NS      b.gtld-servers.net.
com.                    172800  IN      NS      c.gtld-servers.net.
com.                    172800  IN      NS      d.gtld-servers.net.
com.                    172800  IN      NS      e.gtld-servers.net.
com.                    172800  IN      NS      f.gtld-servers.net.
com.                    172800  IN      NS      g.gtld-servers.net.
com.                    172800  IN      NS      h.gtld-servers.net.
com.                    172800  IN      NS      i.gtld-servers.net.
com.                    172800  IN      NS      j.gtld-servers.net.
com.                    172800  IN      NS      k.gtld-servers.net.
com.                    172800  IN      NS      l.gtld-servers.net.
com.                    172800  IN      NS      m.gtld-servers.net.
;; Received 502 bytes from 198.41.0.4#53(198.41.0.4) in 462 ms

oppedahl.com.           172800  IN      NS      dns2.oppedahl.com.
oppedahl.com.           172800  IN      NS      dns1.oppedahl.com.
dig: couldn't get address for 'dns2.oppedahl.com': failure

; <<>> DiG 9.7.4-P1 <<>> dns2.oppedahl.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 28190
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dns2.oppedahl.com.             IN      A

;; Query time: 11 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Feb  3 08:29:30 2012
;; MSG SIZE  rcvd: 35

[klear at idns1 ~]$ dig dns1.oppedahl.com

; <<>> DiG 9.7.4-P1 <<>> dns1.oppedahl.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 21440
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dns1.oppedahl.com.             IN      A

;; Query time: 13 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Feb  3 08:29:39 2012
;; MSG SIZE  rcvd: 35

[klear at idns1 ~]$

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