49 votes

Has my ISP mangled my DNS reverse lookup record for a single static IP address?

Look at the answer section a little more closely: ;; ANSWER SECTION: 444.333.222.111.in-addr.arpa. 86365 IN PTR main.funkeedomain.org.333.222.111.in-addr.arpa. Specifically, the value of the ...
Andrew B's user avatar
  • 33k
47 votes
Accepted

How can this tool find out registered domains from an IP address?

It's brute force. They have looked up the IP addresses of every domain name they can find, and then compiled the results into their own database.
Michael Hampton's user avatar
33 votes
Accepted

Has my ISP mangled my DNS reverse lookup record for a single static IP address?

444.333.222.111.in-addr.arpa. 86365 IN PTR main.funkeedomain.org.333.222.111.in-addr.arpa. Seems that in the reverse DNS zone data somebody forgot to add a trailing period . to your hostname to ...
HBruijn's user avatar
  • 80k
19 votes

What's the reverse DNS command line utility?

Try "host" Forward lookup with host: $ host google-public-dns-b.google.com. google-public-dns-b.google.com has address 8.8.4.4 google-public-dns-b.google.com has IPv6 address 2001:4860:4860:...
StackzOfZtuff's user avatar
17 votes
Accepted

Reverse DNS Setup for an IP with multiple domains

Mail servers will cross-check your SMTP server's advertised HELO hostname against the PTR record for the connecting IP address, and then check that the returned name has an address record matching the ...
Michael Hampton's user avatar
14 votes
Accepted

Detect spammers on my server

Before I get to my suggestion, I want to comment a bit on something your provider said to you: Received: from mail.com ([94.130.34.42]) by smtp-27.iol.local with SMTP id ...
Michael Hampton's user avatar
12 votes

MXToolbox: "Reverse DNS is not a valid Hostname"

Response from MXToolBox Support: Your PTR record is mail-hosting.dk which is a Domain name. The RFC guidelines say that is must be a hostname such as mail.mail-hosting.dk. Most systems won't ...
Jens Kirk's user avatar
  • 281
9 votes
Accepted

How do I perform a LLMNR query?

Assuming PowerShell is available, use Resolve-DnsName -LlmnrOnly -Name <host> From the linked TechNet page: -LlmnrOnly Resolves this query using only the LLMNR protocol.
jscott's user avatar
  • 24.7k
7 votes

How do I change reverse DNS on Google Cloud Compute?

Google won't configure reverse DNS for you If you had a carrier such as AT&T or an EC2 instance, they offer reverse DNS services. As of now, Google does not offer this as an attribute of their ...
Citizen's user avatar
  • 1,102
7 votes

How do I change reverse DNS on Google Cloud Compute?

Google just launched PTR record for Compute Engine. When you can edit the VM, in the Network interfaces, there is Public DNS PTR Record for configuration. Set it as your domain name and it will let ...
spicydog's user avatar
  • 171
7 votes
Accepted

CNAME as different domain name

Two issues collide here. The first is can a CNAME point to a different domain, to which the answer is yes, that is perfectly acceptable. The second, though, is that in the case of your example, you ...
MadHatter's user avatar
  • 80.4k
7 votes

Detect spammers on my server

In this day and age, trying to do your own mail server is, for the most part, a loosing battle and you are better off finding an affordable service. Having said that.. Look at your logs going to the ...
Francisco1844's user avatar
6 votes

What's the command-line utility in Windows to do a reverse DNS look-up?

11 years have passed and Windows Powershell ships with every release of Windows Server and Client. Resolve-DnsName 8.8.8.8 Name Type TTL Section NameHost ---- ...
Yolo Perdiem's user avatar
6 votes

The incompatibility between Cloudflare and the reverse DNS

The PTR record will need to be set at OVH, however, before being able to do that, you will need to create an A record at CloudFlare for the servers hostname and set that record to not pass through ...
Florin Asăvoaie's user avatar
6 votes

How do I change reverse DNS on Google Cloud Compute?

Theres hope! Paul Nash (Product Manager, GCE, Google) responded · Nov 2, 2016 We recognize that reverse DNS and PTR records in particular are important for certain applications like mail servers, ...
Thomas Schwärzl's user avatar
6 votes

How do I change reverse DNS on Google Cloud Compute?

Following up on this topic, as of now, ie August 2017, Google Cloud gives access to this feature as a ßeta version. The procedure to make it work, as I did is: (I am using this fake ip of 123.456.789....
Jacques's user avatar
  • 161
6 votes
Accepted

How to set up mx records

The problem seems to be that you have other servers than your mail server listed in your MX record, one of which has a lower priority. MX records work on a lowest-priority-first basis, which means ...
MadHatter's user avatar
  • 80.4k
6 votes

Reverse DNS Setup for an IP with multiple domains

It seems like you have misunderstood how PTR records work and what is it for. The question doesn't include any information on how you have tried to set the record: It doesn't change automatically ...
Esa Jokinen's user avatar
  • 49.5k
6 votes

How to confirm who is responsible for serving reverse DNS (PTR) requests an IP block?

If your ip address were 192.0.2.4 and you were using nslookup you'd run the following: set q=ns 4.2.0.192.in-addr.arpa This would show you the name servers responsible for the ip address block in ...
joeqwerty's user avatar
  • 111k
6 votes
Accepted

Configuring a PTR record in domains.google for an SMTP server

PTR is managed by the owner of the IP. You will need to talk with Amazon about it. The public IPv4 address you are using needs to be an Elastic IP though. https://aws.amazon.com/blogs/aws/reverse-dns-...
Ackack's user avatar
  • 1,024
5 votes

rDNS / PTR record when using Cloudflare

It is a good idea to use different (sub)domains for email and web servers. For example mail.example.com and www.example.com This allows you to resolve this issue fairly easily. Typically rDNS is ...
BillThor's user avatar
  • 27.9k
5 votes
Accepted

How to check name servers for reverse DNS

Puting information into whois depends on owner of block address - it's not obligatory. If owner put it, you can ask for example as whois 1.254.150.in-addr.arpa If you want to ask for authoritative ...
undefine's user avatar
  • 1,076
5 votes
Accepted

Do ns1 & ns2 nameservers need a PTR record?

Strictly speaking, there is no requirement for nameservers to have PTR records. It's still a very good idea in order to make sure that these devices are well identified, but no functionality breaks if ...
Andrew B's user avatar
  • 33k
5 votes
Accepted

Reverse DNS/bind named-checkzone "zone NS has no address records (A or AAAA) error"

If the following line is supposed to be the GLUE record: dns IN A 10.100.48.51 you should use the FQDN of your nameserver, rather than DNS shorthand. That record now gets expanded as ...
HBruijn's user avatar
  • 80k
5 votes
Accepted

Multiple mail servers and reverse DNS

Never name your mail servers (or any other server) with the naked domain name. This will break a lot more stuff than forward confirmed reverse DNS lookups. Each server should have its own unique name ...
Michael Hampton's user avatar
5 votes
Accepted

How to append a domain to a PTR resolution?

As far as I know Bind will only append/substitute the implicit zone name 10.10.10.in-addr.arpa. or the explicit value of $ORIGIN (which usually would also be the zone name 10.10.10.in-addr.arpa.) when ...
HBruijn's user avatar
  • 80k
5 votes

How do you configure BIND to forward reverse DNS queries to another DNS server?

The output of DIG led me to discover the issue dig -x 10.60.10.200 ; <<>> DiG 9.9.5-9+deb8u6-Debian <<>> -x 10.60.10.200 ;; global options: +cmd ;; Got answer: ;; ->>...
parsecpython's user avatar
5 votes

How do you configure BIND to forward reverse DNS queries to another DNS server?

Just in case anybody hits this… For recent versions of Bind9 (at least on Debian) it is not sufficient to disable the include "/etc/bind/zones.rfc1918"; statement because Bind9 then automatically ...
Stephan's user avatar
  • 285
5 votes
Accepted

PTR not showing in dig request

Your PTR record seems fine, you can verify that by running dig against your own DNS server. However that doesn't mean much as long as a DNS resolution starting at the root dosn't ultimately arrive at ...
RalfFriedl's user avatar
  • 3,148
5 votes
Accepted

MX record in a reverse zone

It would only make sense if you want to receive mail addressed to eg [email protected] (which seems more than a little unusual). dig 1.0.10.in-addr.arpa MX should work for retrieving the MX ...
Håkan Lindqvist's user avatar

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