That's called "hosting". There only thing "wrong" with it
is they aren't split across two - which is generally recommended
operationally.
Did you customer say why they thought that was a problem i.e.
"can't reach" "won't resolve" etc.?
ARIN says you own that IP space so I'm not sure what you
are trying to tell us...
OrgName: Internet Unlimited
OrgID: ITUN
Address: 602 S. Raguet
City: Lufkin
StateProv: TX
PostalCode: 75904
Country: US
NetRange: 63.151.0.0 - 63.151.7.255
CIDR: 63.151.0.0/21
NetName: QWEST-63-151-0-0
NetHandle: NET-63-151-0-0-1
Parent: NET-63-144-0-0-1
NetType: Reallocated
Comment:
RegDate: 2000-08-04
Updated: 2000-08-04
TechHandle: BM775-ARIN
TechName: Martin, Bob
TechPhone: +1-936-829-2166
TechEmail: dns@lin-tech.net