[CentOS] Help with at Bash script

I am attempting to get a script borrowed from DJB to work on my CentOS-6.6
box.  Simplified it looks like this:

tcpdump -l -n -e port 53 \
  | awk '{if ($14 ~ /A.*?/) print $15}' \
  | while read domain ; do echo $domain ; done ;

The sticking point is the 'while read' construct.  Run just as 'tcpdum | awk'
I get this:

english.stackexchange.com.
www.urbandictionary.com.
www.urbandictionary.com.
www.urbandictionary.com.
www.urbandictionary.com.
api.mywot.com.
a.udimg.com.
a.udimg.com.
fonts.googleapis.com.
. . .

Run with the 'while read $domain ; do echo ' pipe nothing appears whatsoever. 
What am I doing wrong?

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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
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