Questions tagged as ['reverse-dns']

Reverse DNS lookup is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet.
Score: 0
How to disable reverse DNS lookup in Apache 2.2 or in recursive bind
cn flag

I would like to stop Apache (2.2) from doing reverse lookups for client IP addresses. I have

HostnameLookups Off


LogFormat "%h %l %u %t %V \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" port:%p" combined_vhost
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common

in httpd.conf but Apache still in many cases often ...

Score: 0
Fred Fredonando avatar
I need to have my 2 websites to have an individual rDNS record but they both are running on the shared web hosting servers
cn flag

I'm a server noob and want to get some solution or some advice from the gurus of the ServerFault. I currently have two different live websites running and they both are using the shared web hosting servers. But I need to have those two websites to have an individual rDNS record set up for each and to work that out, it seems like I need to have those two websites migrate to two different dedicated server ...

Score: 0
What should be the rDNS PTR records for a self-hosted email server with a website domain hosted elsewhere?
ec flag

We have a self-hosted mail server at our business's single, static IP address ( Our website is hosted by another company at a different IP address ( Our emails use the domain.

Sometimes we send emails to certain clients that get through fine, and sometimes we get bouncebacks from the same client indicating we are blocked. Short-story: I am concerned  ...

Score: 1
tm1978 avatar
BIND9 Forwarding Reverse DNS
in flag

I've set up a BIND9 DNS Server. It should only do forwarding:

  • local.domain1 - forwarders /
  • local.domain2 - forwarder x.x.x.x
  • internet - forwarders /

My files look like:


acl internals {;;; };
include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
include "/etc/bind/named.conf.defaul ...
Score: 0
Julian Dimitrov avatar
BIND9 server for a network with no internet access
jo flag

The question I have is the same as this one, but the accepted answer, and the comments did not helped me solve my issue. I'll put here the whole setup that I have.

BIND9 version - BIND 9.11.5-P4-5.1+deb10u6-Debian (Extended Support Version),

OS - Debian Buster (10.11)


// This is the primary configuration file for the BIND DNS server named.
// Please read /usr/share/doc/bind9/README. ...
Score: 2
tink avatar
Wireshark find DNS response "Refused"
ru flag

I'm looking for a way to filter a packet capture in wireshark for instances where our server responds with "Refused" to a recursive DNS query.

dns.resp.type== doesn't seem to offer anything that I see as a match to my request, do I need to look somewhere other than under dns.resp altogether?

Score: 5
rgb255_255_255 avatar
How to confirm who is responsible for serving reverse DNS (PTR) requests an IP block?
gb flag

Before anyone answers "ask your ISP" or "ask your hosting provider", please read in full.


  • I own a domain name mydomain.example, and a publically routed IP block (say
  • The NS records (GLUE) for this domain are configured at my registrar - ns1.mydomain.example and ns2.mydomain.example which point to my servers (self-hosted DNS servers)
  • Reverse DNS for my publically routed IP ...
Score: 0
Using NGINX to Access Synology services without port numbers?
it flag

First, I apologize if this isn't the right forum as this is somewhat of a networking question.

To give a brief explanation of what I want to achieve is basically have the services or apps provided by Synology be accessible via a simple URL without port numbers. I have a dedicated IP address, so I don't have to worry about setting up DDNS.

I thought all I would need to do is setup a very small NGINX s ...

Score: 0
Adam avatar
Replace VPS rDNS FQDN with a mail subdomain
ar flag

I have a VPS with a single IP address and multiple domain names.

I used to check the spam rate of my email. And my results are:

    Your IP address is associated with the domain
    Nevertheless your message appears to be sent from
    You may want to change your pointer (PTR type) DNS record and the host name of your server to the same ...
Score: 0
Adam avatar
DNS PTR lookup deprecated?
ar flag

When I use dmarcanalyzer to check my domain I get the message:

Warning : You shouldn't use PTR lookups as they are deprecated

My record looks like this: v=spf1 ip4: ip4: ip4: ~all

What part exactly is deprecated? I tried Googling but all I get are sites where I can do a PTR record lookup or unclear (to me) examaples.

Score: 0
William avatar
iprev check for multiple ipv6 addresses
ru flag

Can I add multiple PTR records mapping multiple IPV6 addresses to the same domain, and add multiple AAAA records mapping the same domain to to the same set of IPV6 addresses, to let pass the iprev check?

Score: 0
William avatar
How to set rDNS record for ipv6 address block?
ru flag

Occasionally, I open a ticket at my VPS provider to let them create a rDNS record for me. Sometimes, I can find a page in my control panel to add the rDNS record myself. This is simple for ipv4 address. I just input an ip address and a domain name to create the rDNS record. I wonder how to add rDNS record for a block of ipv6 addresses such as a 2^64 address block. Do I have to add 2^64 rDNS records each ...

Score: 1
solveit avatar
Domain whitelisting in Kubernetes DNS Service
ar flag

Can I use Kubernetes dns service to whitelist the domains for my pods? I want to restrict the outgoing (egress) calls using Kubernetes dns service. if I can achieve this, can someone let me know the steps required to implement this.
Note: I see in my default pods that coredns pod is already present with image: rancher/coredns-coredns:1.8.3. I understand that it comes default with k3s.

PS: I have  ...

Score: 0 avatar
Configuring Reverse DNS for an emulated DNS server hierarchy using BIND
cn flag

I'm emulating a network using Kathara (similar to Netkit) and I'm having trouble figuring out how to get reverse DNS to work across all three networks.

This is the topology

And this is the DNS hierarchy

I did manage to get recursive lookup to work. When queried for a name not in its database, would query nsroot, then go down the hierarchy, finally getting a response from the authoritativ ...

Score: 0
Reverse DNS for multiple subdomains
bn flag

We're setting up a system where each of our users gets their own subdomain of for sending / receiving emails, and they can set up multiple mailboxes under that subdomain. We also want to allow them to use their own domain. E.g.:

Main domain:

User 1 has two mailboxes set up:

User 2 has one mailbox set up:

mai ...