If you (or your customers) have difficulties resolving domains
in the US zone, it was moved recently moved to a new set of
servers. Nothing special, except they are all in 209 net
space, and are being announced as /24 network routes. There
is no covering CIDR aggregate being announced, so providers
which still filter 209 CIDR blocks (i.e. an obsolete copy of
access-list 112) you may have difficulty reaching the new
servers.
a.gtld.biz. 209.173.53.162
b.gtld.biz. 209.173.57.162
c.gtld.biz. 209.173.60.65
route-server>show ip bgp 209.173.48.0/20 longer
BGP table version is 502125, local router ID is 134.24.38.246
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 209.173.53.0 134.24.127.30 35 0 1740 7018 701 7786 i
*> 209.173.57.0 134.24.127.30 35 0 1740 7018 7786 i
*> 209.173.58.0 134.24.127.30 35 0 1740 7018 1 7473 9911 7786 ?
*> 209.173.60.0 134.24.127.30 35 0 1740 7018 209 7786 i
This is strictly a network routing issue, and has nothing to
do the merits of Neustar, ICANN or any other DNS issue. If
you, and all your upstreams, accept /24's you shouldn't see
any problems.