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Hmm.. Amazon.com does use them. Why? lol
;; ADDITIONAL SECTION:
udns2.ultradns.net. 52273 IN A 204.74.101.1
udns1.ultradns.net. 50561 IN A 204.69.234.1
pdns6.ultradns.co.uk. 50647 IN A 204.74.115.1
pdns5.ultradns.info. 50672 IN A 204.74.114.1
pdns4.ultradns.org. 50672 IN A 199.7.69.1
pdns3.ultradns.org. 50672 IN A 199.7.68.1
pdns2.ultradns.net. 51078 IN A 204.74.109.1
pdns1.ultradns.net. 51078 IN A 204.74.108.1
but not for Alexa
;; ADDITIONAL SECTION:
ns2.alexa.com. 50541 IN A 209.237.236.229
ns2.unitedlayer.com. 148116 IN A 209.237.230.22
ns1.alexa.com. 50541 IN A 209.237.236.228
ns1.unitedlayer.com. 148116 IN A 209.237.230.11
yes for IMDB
;; ADDITIONAL SECTION:
udns2.ultradns.net. 52216 IN A 204.74.101.1
udns1.ultradns.net. 50504 IN A 204.69.234.1
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