messages in log

[Dana Holland]

I'm running Bind 9.4.2 on an AIX box.  I'm seeing tons of these messages 
in the log of my master server.  Years ago our domain was nav.cc.tx.us, 
but we moved to a different domain - probably 4 years ago or more.  We 
no longer have any zone files for nav.cc.tx.us.  Are these being caused 
because some server thinks we're authoritative for that domain?

Jan 29 15:39:55 dns named[8722]: client 206.24.209.21#45438: query 
(cache) 'nav.
cc.tx.us/MX/IN' denied
Jan 29 15:39:55 dns named[8722]: client 209.67.116.185#49386: query 
(cache) 'nav
.cc.tx.us/MX/IN' denied
Jan 29 15:39:55 dns named[8722]: client 209.67.116.186#39272: query 
(cache) 'nav
.cc.tx.us/MX/IN' denied
Jan 29 15:39:56 dns named[8722]: client 206.24.209.21#45438: query 
(cache) 'nav.
cc.tx.us/MX/IN' denied
Jan 29 15:39:56 dns named[8722]: client 209.67.116.185#49386: query 
(cache) 'nav
.cc.tx.us/MX/IN' denied
Jan 29 15:39:56 dns named[8722]: client 209.67.116.186#39272: query 
(cache) 'nav
.cc.tx.us/MX/IN' denied
Jan 29 15:39:56 dns named[8722]: client 206.24.209.21#45438: query 
(cache) 'nav.
cc.tx.us/MX/IN' denied
Jan 29 15:40:03 dns named[8722]: client 64.50.254.218#1069: query 
(cache) 'nav.c
c.tx.us/MX/IN' denied
Jan 29 15:40:03 dns named[8722]: client 64.50.254.218#1069: query 
(cache) 'nav.c
c.tx.us/A/IN' denied
Jan 29 15:40:03 dns named[8722]: client 64.50.254.218#1069: query 
(cache) 'nav.c
c.tx.us/A/IN' denied
Jan 29 15:40:09 dns named[8722]: client 12.120.125.48#33224: query 
(cache) 'NORT
ON-SERVER.nav.cc.tx.us/A/IN' denied
Jan 29 15:40:09 dns named[8722]: client 12.120.125.48#33224: query 
(cache) 'worm
hole.nav.cc.tx.us/A/IN' denied
Jan 29 15:40:09 dns named[8722]: client 12.120.125.48#33224: query 
(cache) 'worm
hole.nav.cc.tx.us/AAAA/IN' denied
Jan 29 15:40:09 dns named[8722]: client 12.120.120.184#37992: query 
(cache) 'NOR
TON-SERVER.nav.cc.tx.us/A/IN' denied
Jan 29 15:40:10 dns named[8722]: client 66.109.241.25#1051: query 
(cache) 'nav.c
c.tx.us/MX/IN' denied
Jan 29 15:40:10 dns named[8722]: client 12.120.120.184#37992: query 
(cache) 'wor
mhole.nav.cc.tx.us/AAAA/IN' denied
Jan 29 15:40:15 dns named[8722]: client 151.193.224.248#32771: query 
(cache) 'na
v.cc.tx.us/MX/IN' denied
Jan 29 15:40:26 dns named[8722]: client 72.18.235.228#1061: query 
(cache) 'nav.c
c.tx.us/MX/IN' denied
Jan 29 15:40:27 dns named[8722]: client 72.18.235.228#1061: query 
(cache) 'nav.c
c.tx.us/A/IN' denied