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In case there's no reverse ptr for ping -a <ip> or nslookup <ip> to show, you can run ipconfig /displaydns | clip, open a text editor, paste, and search for the IP there. Note that this will work only if the original DNS query was done via the Windows DNS resolver - some apps do their own DNS queries, like newer browsers using DNS-over-HTTPS ...
Reverse DNS lookups are done by checking the pointer (PTR) records. If you wanna do reverse DNS for "1.2.3.4", you have to lookup pointer records for "4.3.2.1.in-addr.arpa". My function takes in an IP address, reverses the order of the octets (i.e. changes it from 1.2.3.4 to 4.3.2.1), and then uses dig to execute the PTR lookup I just described.
But a reverse DNS lookup still only provides the the ISP name: cust.static.213-xxx-yyy-zzz.swisscomdata.ch. In that case, it looks like Reverse DNS is working fine, at least from your end. Confirm this with an external Reverse DNS lookup tool to confirm other servers see the same thing. If that finds the reverse DNS entry, then it's possible ...
Most SMTP servers will accept your mail if you simply have a reverse DNS entry. It does not have to match the domain name on your e-mail address. Some SMTP servers will reject mail if the reverse DNS doesn't match the HELO/EHLO hostname used in the connection. If your mail server's hostname is mail.example.com then your reverse DNS, MX record ...
Only Digital Ocean can control the reverse DNS, as the PTR records aren't on your zone, but on an in-addr.arpa. zone controlled by the owner of the IP address. A Digital Ocean Community question has an answer to this: The Reverse DNS is configured automatically from our end based on the droplet’s hostname.
1. Setting UseDNS=no only disables verification of reverse DNS against forward DNS. It does not disable the query, which can be guaranteed useless and require DNS timeouts in various mixed DNS or DHCP environments. Many people are confused about this. The only way to disable the DNS lookups is to run sshd with the "-u0" option, which ...
10. I am trying to clarify my Reverse DNS PTR lookup for a domain. I have a server with a single IP addresses and multiple accounts, all sharing that IP address; My PTR is currently: 24.210.31.in-addr.arpa. 14400 IN PTR domainname.co.uk. But the domain that the IP address reverses to is ns1.domainnetwork.co.uk, therefore should the PTR record ...
The forward DNS entries ("A" records) for windows machines on the domain are populated automatically. However, the reverse DNS entries ("PTR" Records) are not. The reverse lookup zone exists, and I can add entries to it manually, but it doesn't automatically populate. Dynamic updates are enabled for both the forward and reverse zones.
Resolve-DnsName fails for those systems when using different flags such as: -DnsOnly, -NoHostsFile, -LlmnrNetbiosOnly (but does work for the other IP address that nslookup can resolve). PS C:\> Resolve-DnsName 10.185.140.22 -DnsOnly. Resolve-DnsName : 22.140.185.10.in-addr.arpa : DNS name does not exist. At line:1 char:1.
On the other side, in Windows the reverse lookup seems to be pretty much hard-coded (see a related question Globally disable reverse DNS lookup for Kerberos on Windows? The problem is that the reverse lookups not only break the usage of server aliases (CNAMES), but their optional-ity can cause really unexpected and unstable behavior when ...