Nope:
dig @y.ns.gin.ntt.net usps.com
; <<>> DiG 9.8.0-P1-RedHat-9.8.0-3.P1.fc15 <<>> @y.ns.gin.ntt.net usps.com
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46511
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;usps.com. IN A
;; ANSWER SECTION:
usps.com. 292 IN A 204.11.56.21
;; Query time: 20 msec
;; SERVER: 129.250.35.251#53(129.250.35.251)
;; WHEN: Thu Jun 20 01:10:09 2013
;; MSG SIZE rcvd: 42
/M