The best replacement for ptr is uspta.

The best alternatives to ptr are rated as following:
★★★★★  uspta
★★★★★  m1a
★★★★  dsa
★★★  cname
★★★  cetme
★  ar10
★  hk91
★  spf
★  rdns
★  reverse dns
★  shared_ptr
★  ptc
★  auto_ptr
  naptr
  shared ptr

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ptr
uspta
m1a