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.

learn more… | top users | synonyms (1)

1
vote
2answers
21 views

How do I change reverse DNS on Google Cloud Compute?

How do I change reverse DNS on Google Cloud Compute? I want to add reverse DNS to Google Cloud Compute and can't figure out howto do it. I want to map 11.97.196.104.bc.googleusercontent.com to ...
1
vote
2answers
38 views

Why do email headers show the wrong IP address from my Exchange server?

Please help me re-frame question for positive use if needed, thank you I use two domains mail.hpdist.com and mail.hpsteaks.com. I am a little unsure how to properly walk through the testing as it ...
-2
votes
1answer
27 views

My Email Strightly goes to gmail spam/just folder ( DKIM,SPF,DMARC is okay ) [duplicate]

( it's not duplicate , its related to rDNS , please don't flag it as duplicate or give me the link of related one ) i have a problem, my emails from my mydomain.com straightly goes to spam folder in ...
0
votes
1answer
189 views

SMTP: Received from unknown [xxx.xxx.xxx.xxx] -> but IP does have a valid PTR/RDNS

I got the following problem. I got an smtp-relayserver that collects outgoing mails from other servers and checks them (spam assassin). Now the headers are showing this: Received: from ...
2
votes
1answer
51 views

Do ns1 & ns2 nameservers need a PTR record? [duplicate]

I wonder whether my 2 nameservers need a PTR record. As you may know the PTR record or reverse DNS is important for mail server hostname as it improves chances for your outgoing emails to be accepted ...
0
votes
2answers
60 views

List all DNS records for host

We have an issue with DNS in our environment where the DNS record for a computer will not get updated when it moves to a new subnet. I manage our desktops so I have no access to nor am I involved with ...
-2
votes
1answer
74 views

How to create RDNS (Reverse DNS) [closed]

How to create a RDNS (Reverse DNS) in centos or Ubuntu [PTR record] I searched a lot in Internet and didn't find any solutions. I got a idea it can be done by BIND or BIND9. In some forum i seen ...
0
votes
0answers
39 views

hostname is not working in HTTP, but IP is Working fine

I have a lab setup with 2 DNS and 2 DC with 10 other machines. i have assigned every machine in static IP. its all in 10.77.205.0/24 network.. i can access the machines application via http by using ...
0
votes
2answers
91 views

The incompatibility between Cloudflare and the reverse DNS

I'm already activated Cloudflare for my website and to apply that I had to replace my domain default nameservers with Cloudflare nameservers. Now my website has to send emails to the mail servers, but ...
1
vote
1answer
78 views

How to check name servers for reverse DNS

I use whois example.com to check which are the authoritative name servers for that domain. Now I want to know which are the authoritative name servers for a block of IP addresses for their PTR ...
0
votes
1answer
70 views

rDNS / PTR record when using Cloudflare

I know that Cloudflare, does not support mail trafic and uses dynamic IP's to protect the servers behind it, But I really need to be able to do rDNS lookups on my IP. I have turned of the Caching and ...
1
vote
1answer
44 views

Configuring private name servers and reverse DNS

I have a VPS setup to host five domains from a single IP address. After some help from a previous post here, my DNS for the main domain has this configuration: ; cPanel first:11.34.2.8 ...
-4
votes
2answers
49 views

What are all the uses for PTR records / Reverse DNS in the context of web hosting? [closed]

What are all the service uses for PTR records in a IPv4 & IPv6 environment apart from the human use of finding a hostname from an IP address? Are PTR records used by common web hosting services ...
-1
votes
3answers
36 views

What hostname and rDNS should I choose?

What should I set as hostname and rDNS? 1 server 3 domains (domain1.com, domain2.net, domain3.de) 1 mail server for each domain My current settings: /etc/hosts 127.0.0.1 localhost 11.22.33.44 ...
1
vote
0answers
20 views

FCrDNS for a mail server that also runs other services (http, ftp etc)

I am learning how to administer productive internet-facing machines and services, and towards that end setting up mail, web, and a couple other services, all on the same box (budget constraints and ...
0
votes
1answer
45 views

Zone transfer file is denied

I am implementing this in my home network so If I swap the role from master to slave [ this machine should work as primary server for ns.insec and slave server for not.insec in machine 1 and in ...
0
votes
1answer
80 views

Azure - Add PTR record to Linux VM (Resource Manager)

I want to add a PTR record to my Linux VM on Azure (resource manager) https://azure.microsoft.com/en-us/documentation/articles/resource-group-overview/ I know what PTR record is, ;) I have also read ...
0
votes
1answer
94 views

Sendmail not sending emails

The Apache server I've inherited from my predecessor doesn't send emails. When a web application hosted on the server needs to send an email, it blocks all other processes while it tries to send it ...
0
votes
1answer
105 views

No PTR record according to gmail

Recently, I installed iredmail on my VPS and configured DNS records (including ptr). It confirms nslookup: nslookup zelenin.top Name: zelenin.top Address: 191.101.251.182 nslookup -query=mx ...
1
vote
3answers
73 views

Can I Run My Web Service and DNS Service on the Same Server?

I am quite new about Linux. I wonder if I could run DNS and Web Server on the same server? The reason is I have a server which they want me to set it up as a DNS & RevDNS server with the ...
0
votes
2answers
214 views

Reverse DNS while using Azure Resource Manager

I am very much aware that Reverse DNS is possible on Azure Cloud Services. That's not what I'm asking about. I need to know if it's possible when using Azure Resource Manager. I've looked around a ...
0
votes
1answer
33 views

Roots server do not update my new nameserver (CentOS bind DNS server)

Last week, I changed my dns nameserver from dns2.applistar.com to ns1.applistar.com. But after that, my DNS server was downed. I do not know why :(. I reconfig everything, but it still downed. I ...
1
vote
3answers
171 views

Reverse DNS does not match SMTP Banner [duplicate]

I'm new to this site but I have found many good answers on this site before. I have also searched for my actual question but I didn't found the answer or at least I didn't understand what should I do ...
2
votes
1answer
82 views

PTR record format for IPv6

What is the difference in the following two IPv6 PTR formats? 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR smtp.example.com. ...
0
votes
1answer
61 views

Configuring rDNS and PTR Record [duplicate]

I know that here was a few questions about it, but they didn't answer my question. Here is my issue. I have a mailserver on my dedicated server with full access. In robots I wrote down these lines of ...
0
votes
1answer
39 views

How do I create rDNS (Reverse DNS)

How to create rDNS (Reverse DNS), I am using Centos 7.0 and I need to create rDNS for 50 IP's and domain. Can you please guide me how can I create. Example. Example.com - xxx.xxx.xxx.xx0 ...
1
vote
1answer
110 views

“Bad PTR DNS Resource Record” when sending E-Mail from Shared Hosting

I have a virtual server with one IP x and have multiple sites a.com and b.com running on it. When accessing x in the browser, I get to homepage a.com. Sending an e-mail from a.com to GMX is without ...
1
vote
1answer
28 views

How to redirect MX records to origin domain name?

For a home setup I only have 1 public IPv4. So I have to use it for all my hosts. Luckily I have only one. So in the DNS I use the at sign @ to define the origin, example.com with an A record where I ...
0
votes
1answer
80 views

hMailServer and reverse DNS

I have an hMailServer installation on a Windows 2012 server VM and need to properly set up reverse DNS + the mail server in order to avoid getting e-mails bounced back from certain big providers, ...
0
votes
2answers
77 views

How reliable is validating email domain by reverse DNS MX record checking [duplicate]

This question is not about how to protect against spam or validate a particular email user. But how reliable is validating emails domain (does it exists at all) by reverse dns. What are the pitfalls ...
0
votes
0answers
36 views

ipv6 rDNS with bind

Maybe I just can't wrap my head around ipv6 yet but I'm having trouble returning DNS entries for rDNS. Considering the ipv4 scheme, the following is what I'm aiming for: internal.example.com should ...
0
votes
1answer
30 views

Make BIND DNS server to “remember” the resolved names

I have a corporative VPN server where every client request (the IP address of the server they are accessing) are being logged via an script with tcpdump. However, the logs are not really useful ...
0
votes
2answers
28 views

Reverse DNS Record when MX record (Original.com) to move to other places (that ip range is another domain name like another.com)

I'm recently moved the email server from Company branch A to Company branch B. Branch A company is using original.com and branch B is using another.com Scenario: Branch A Original.com ( 192.0.0.1 ...
1
vote
3answers
89 views

Reverse DNS is not working

I got a mail server that can't send outbound because I don't have my reverse dns entries correct. Admittedly at first I knew it wasn't configured properly but from every single example I could find on ...
0
votes
1answer
100 views

Centos 7 DNS Server /PTR/IN' **denied**

I need help, i've spend some time to troubleshoot the dns server that i created. but what happend is: when i tried to resolve the address i receive below log: Nov 15 04:21:01 mydnshostname00 ...
-1
votes
1answer
45 views

some emails do not send because wrong IP of destination mailserver

in my postfix log files I found a strange thing. some domains resolve always to the same one IP address, but not every time. Just sometimes. Oct 28 14:51:46 maxi postfix/smtp[4057]: 5628514640F0: ...
1
vote
2answers
84 views

WARNING: At least one of your NS name does not seem a valid host name

So here is the issue I am having. When I run a DNS check on my TLD I am getting conflicting results. The domain name is newage.design and my NameServers are NS1.newage.design, NS2.newage.design, and ...
1
vote
1answer
26 views

Use ip address for name server and have it dedicated to a single site

Ok so I think I have this setup right but I just want to be sure. I have 3 IP address: 1.1.1.1 also known as ns1 2.2.2.2 also known as ns2 3.3.3.3 also known as ns3 They are being used as ...
0
votes
0answers
79 views

Curl Error Connection timed out

I have a website (www.example.com | 123.456.789), in that machine i only have 1 web app running. i am trying to use php file_get_content() to a file which in my own server (located on some file like ...
1
vote
1answer
82 views

DNS Active Directory Zone Replication Scope (Forest vs Domain)

When I create a new Domain Controller with dcpromo then the wizard will also add a DNS Role to the server because the first domain controller must be the global catalog server for the forest. After ...
0
votes
1answer
29 views

DC Promo With DNS Windows 2008R2 Resulting In Weird Network Error

I am preparing for DC domain migration in which I am encounter some error that I had never encounter in my VM testing environment. Note: This is the first time I am setting up an active DC with DNS. ...
-1
votes
1answer
51 views

Mail and Webserver on single Host, Reverse DNS not matching

I have a vServer from Server4You and installed a mailserver with postfix, dovecot and slapd for authentification, my problem is: All the emails send from the server to outlook or gmail land in the ...
1
vote
1answer
66 views

Postfix/Spamassassin can't determine rDNS too often

I am running a Debian 7.9 server with Postfix 2.9.6 and Spamassassin 3.3.2. One of the standard checks Spamassassin does, is to check for a rDNS record. I am assuming that it gets that info from the ...
1
vote
0answers
43 views

Reverse DNS for 172.* [closed]

Our private network is a large 172.* with many subnets. I'd like to have one DNS server for the whole deal if possible. I have this working in the forward direction but not in the reverse. Bind9 on ...
-1
votes
1answer
1k views

Delivered to internal network by a host with no rDNS

Recently our emails started going to spam for recipients at Gmail and Yahoo mail. I ran a SpamAssassin test, and have found the following: pts rule name description 0.0 ...
0
votes
1answer
123 views

How do I find the actual domain for an IP addresses in my web log that uses a CDN?

I'm trying to analyze our web access log to report on which organizations are accessing our website. But for many of the IP addresses in the log, the reverse DNS lookup resolves to CDN domain names ...
0
votes
1answer
1k views

Linux PCs sending “ICMP udp port unreachable” to DNS server

So digging around in my syslog I have been noticing a lot of ICMP packets being flagged by our ASAs: %ASA-4-313005: No matching connection for ICMP error message: icmp src Internet:x.x.21.122 dst ...
7
votes
2answers
448 views

Is it valid to have several IP addresses resolving back (PTR) to one name that doesn't match either of the relevant A records?

I have several devices, each with its own IP address. There are various names pointing to these addresses (in several different domains). As an example the device with IP address 10.0.0.1 is known ...
-2
votes
1answer
54 views

reverse dns configuration not working

I am configuring my reverse dns server, after installation then I run the following: nslookup 110.74.133.89 Server: 192.168.101.4 Address: 192.168.101.4#53 ** server can't find ...
1
vote
2answers
279 views

multiple ptr record in bind

I'm running some small ISP here and I own couple of IP ranges. I have given a few public IP addresses to some of my customer and they are running mail servers on them. They have demanded me to add ...