$ORIGIN 2.0.192.in-addr.arpa.
;
1 PTR host1.organizationA.com.
2 PTR host2.organizationA.com.
3 PTR host3.organizationA.com.
;
129 PTR host1.organizationB.com.
130 PTR host2.organizationB.com.
131 PTR host3.organizationB.com.
;
193 PTR host1.organizationC.com.
194 PTR host2.organizationC.com.
195 PTR host3.organizationC.com.