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Should resolve the name from the IP address if the reverse lookup zone has been set up properly. If the reverse lookup zone does not have an entry for the record, the -a will just ping without a name.
Reverse DNS lookups simply ensure that the IP is a PTR record to the server name. If you can post the headers/bounce messages of an example delayed or reject message, we should be able to narrow down why they're having issues.
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.
What's the command to find the name of a computer given its IP address? I always forget what this command is, but I know it exists in Windows and I assume it exists on the *nix command-line.
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. To rename your droplet via the control panel, do the following: Login to the Digital ...
Learn how to configure reverse DNS for an IP that hosts multiple domains and why it is important for email delivery and security.
We use windows server 2003 for DNS on our network. 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.
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?).
8. sshd seems to almost always try to perform a reverse DNS lookup on new connections. For hosts without a PTR entry this causes delays of 5 seconds per query. Sometimes it accepts the connection immediately, sometimes it tries to resolve once, sometimes twice. I observed this using tcpdump port 53 while trying to connect to the server.
However, Resolve-DnsName PowerShell command returns the hostname for the reverse lookup. There are two unusual things I observe here: It returns the hostname without the DNS domain. With other IP addresses (that nslookup can resolve), we see it comes from the Answer section and with a DNS domain.