code: func (r Dns_Domain) CreatePtrRecord(ipAddress *string, ptrRecord *string, ttl *int) (resp datatypes.Dns_Domain_ResourceRecord, err error) {
  	params := []interface{}{
  		ipAddress,
  		ptrRecord,
  		ttl,
  	}
  	err = r.Session.DoRequest("SoftLayer_Dns_Domain", "createPtrRecord", params, &r.Options, &resp)
  	return
  }
docs: // setPtrRecordForIpAddress() sets a single reverse DNS record for a single IP address and returns the newly created or edited [[SoftLayer_Dns_Domain_ResourceRecord]] record. Currently this method only supports IPv4 addresses and performs no operation when given an IPv6 address.