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Questions tagged [ptr-record]

PTR is a type of record in DNS system used for reverse DNS lookups (IP address to hostname)

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5 answers
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How do I check a PTR record?

I need to check a PTR record to make sure that a script I have is sending emails which will actually be received by my users and not be incorrectly marked as spam. I understand that the ISP which ...
Daisetsu's user avatar
  • 667
46 votes
3 answers
66k views

Why multiple PTR records in DNS is not recommended?

I often read that using multiple PTR records in a DNS configuration is not recommended. However, the reasons are often vague, or not so obvious, naming: "it can cause problems", "can ...
Totor's user avatar
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19 votes
2 answers
28k views

PTR record (rDNS) for multiple domains on a shared IP address

I host multiple domains on a single IP address: cats.com A @ --> 10.20.30.40 A mail --> 10.20.30.40 MX @ --> mail dogs.com A @ --> 10.20.30.40 A mail --> 10.20.30.40 MX @ --> ...
dbasch's user avatar
  • 417
18 votes
6 answers
64k views

Reverse DNS records not registered when using DHCP

I've stumbled upon a strange behaviour with Windows machines, which seems to be fairly consistent between all Windows versions from Vista/2008 to 8.1/2012 R2; it doesn't happen instead when using ...
Massimo's user avatar
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12 votes
2 answers
46k views

Reverse DNS is not a valid hostname [closed]

I help a friend run a server, which includes a mail server. http://mxtoolbox.com reports that our reverse DNS is not a valid hostname. The reverse DNS currently points to domain.com. Should it point ...
ConnorJC's user avatar
  • 949
11 votes
5 answers
89k views

How to setup PTR (Reverse DNS) at Godaddy DNS manager

My hosting provider already did PTR setup. Now i have to setup it at my DNS holder i guess. What am i supposed to do at my Godaddy account. thank you. my ip : 64.250.113.235 and you can check my ptr ...
Furkan Gözükara's user avatar
11 votes
4 answers
25k views

Gmail does not accept mail from a new server

I am setting up a new server and discovered that Gmail does not accept emails from this server. I checked Exim logfiles and found the following: Our system has detected that this\n550-5.7.1 message ...
user189078's user avatar
10 votes
4 answers
37k views

Reverse DNS Setup for an IP with multiple domains

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....
Martin's user avatar
  • 217
9 votes
5 answers
11k views

How important are PTR records for Email Servers?

Does anyone know of any studies done to show how much email will be rejected if there is not ptr record for the SMTP banner name of an email server? Are reverse checks always done when enabled, or ...
Kyle Brandt's user avatar
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7 votes
7 answers
3k views

Importance of PTR records on nameserver IP's?

I have not yet experienced any DNS failures due to a missing PTR record, but am wondering: Is there any added value in having a valid PTR record on a nameserver IP-address?
Aron Rotteveel's user avatar
7 votes
2 answers
6k views

How to determine which DNS server has the authority to set rDNS (PTR records)?

or to re-phrase... How to determine to whom authority has been delegated to set rDNS? Background In a multi-tier environment, where a block of IP's is assigned, then further split and assigned (...
Peter White's user avatar
7 votes
2 answers
3k views

How are DNS PTR records managed?

As I understand it, an IP address-owner can set up a DNS PTR record for his IP address to map the IP addresses to its host names. There are some things about this I don’t understand. I’ve managed ...
Martin's user avatar
  • 71
7 votes
3 answers
21k views

how to add a REverse PTR Record on Amazon Route 53?

if i have the below ip 168.144.254.X and i would like to add a ptr record in amazon in the form of X.254.144.168.in-addr.arpa what should be in the name field and what should be in the value field ...
Oscar Cabrero's user avatar
6 votes
7 answers
8k views

Does a PTR record prove anything about the sender's email domain?

My outgoing mail server has problems reaching some recipients. This happened after we changed ISP for our dedicated IP address. I think it might be due to PTR records, but I cannot be sure. My ...
Jake's user avatar
  • 1,172
6 votes
5 answers
29k views

SMTP Reverse DNS Mismatch

My dedicated server ns382087.ovh.net resolves to 46.105.98.72 and hosts multiple domain with several dedicated IP addresses. Each new IP address is added to /etc/network/interfaces Among them, the ...
TheFoOL's user avatar
  • 163
6 votes
1 answer
12k views

Gmail does not accept mail from a new VPS server with PTR setup

I have PTR records setup but I am not able to deliver mail to Gmail accounts: host gmail-smtp-in.l.google.com[2607:f8b0:4004:c08::1b] said: 550-5.7.25 [2a01:4ff:f0:a7b6::1] The IP address sending ...
pwz2000's user avatar
  • 163
6 votes
2 answers
11k views

Entering multiple DNS TXT values as a single TXT entry, with each value in " marks, but separated by spaces

I have done this with other DNS providers but I'm stuck on UltraDNS's DNS management interface. I need to enter multiple values in a TXT entry so they resolve as a single string with each value in &...
Devin Blagbrough's user avatar
5 votes
2 answers
16k views

Do I need to Set-up PTR record in SPF Setting?

I have set-up the RDNS from my hosting provider for the ip address to resolve to "maximus.example.com". After that, do I also need to add the PTR records to the SPF Text details in my DNS zone file as ...
Neel's user avatar
  • 1,481
5 votes
2 answers
6k views

Are PTR records added only by the ISPs that provide and manage the IPs?

I am administering a network with many locations and work with multiple providers I checked out with my DNS provider to change the PTR records for one of the IPs, they replied: Dear Sir, We ...
Eduard Florinescu's user avatar
5 votes
2 answers
2k views

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

Before anyone answers "ask your ISP" or "ask your hosting provider", please read in full. Scenario: I own a domain name mydomain.example, and a publically routed IP block (say 192....
rgb255_255_255's user avatar
5 votes
3 answers
14k views

How should I set up my PTR Record?

I am trying to properly set up my ptr record as I have noticed that some email notifications sent from my website have gone to spam for certian people, and I am having trouble figuring out exactly ...
user avatar
4 votes
4 answers
12k views

How do you know if reverse dns is setup correctly on your server

Total newb question I know, but I just want to be sure.
trustfundbaby's user avatar
4 votes
3 answers
640 views

What services require properly configured PTR records?

I manage a few DNS servers (Bind9, Windows Server 2008 R2) that are used internally. I have always taken the time to make sure that the correct corresponding PTR records were configured for Reverse ...
user avatar
4 votes
2 answers
29k views

How do I set up a reverse zone file?

I have this zone file in bind: $TTL 86400 mysite.net. IN SOA ns1.mysite.net. admin.mysite.net. ( 2006012008 86400 3600 604800 86400 ) ...
lillolollo's user avatar
4 votes
2 answers
17k 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 ...
user3521621's user avatar
4 votes
1 answer
7k views

How to add reverse dns record on cloudflare [closed]

I need to set PTR record on my cloudflare account, because all outgoing mails are going to spam. I do not see ptr record in my cloudflare account. Can I use txt/srv record instead?
Anom's user avatar
  • 111
4 votes
1 answer
21k views

What steps to do to set the DNS PTR record, is the IP in reverse in the name needed?

I had the following error: <[email protected]>: host yyyyyyyyyyyy.yyyyyyyyyyyyy.de[33.33.33.33] refused to talk to me: yyyyyyyyyyyy.yyyyyyyyyyyyy.de (mxeue106) Nemesis ESMTP ...
Eduard Florinescu's user avatar
4 votes
5 answers
10k views

Discover server responsible for serving a PTR for a specific IP?

Just as the title reads: How do I discover what nameserver is the authoritative nameserver for PTR records for a specific IP?
CarpeNoctem's user avatar
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4 votes
4 answers
7k views

How to determine if my mail server is configured correctly?

Does anyone know of an online service (similar to the ones that tell you if a site is up or down) that can connect to a specified mail server and perform checks to see if it is configured correctly? ...
Adam M-W's user avatar
  • 141
3 votes
5 answers
1k views

DNS, PTR, Mail Server HELP!

I am not really sure which route to take. Here is my current setup. We host our web server on RackSpace Cloud (moved from EC2) Previously we hosted our own name servers, now we use RS (RackSpace) ...
Physikal's user avatar
  • 570
3 votes
3 answers
4k views

Moving from one ISP to another; DNS PTR question

We are going to be moving from one ISP to another in the next month or so, and I will be changing the TTL's down to 60 seconds on the DNS servers that I have authority for, but our current ISP has ...
bgarlock's user avatar
  • 129
3 votes
2 answers
9k views

which one is best for PTR record: domain or hostname

I have a VPS with the following IP: 82.197.45.124 domain: example.com hostname: server.example.com PTR record: 82.197.45.124 > server.example.com There is no an "A" record for "server" mood@desk:...
thomas's user avatar
  • 133
3 votes
3 answers
10k views

DNS PTR record when domain on shared IP address

I own a typical shared IP hosting plan and domain. I can modify the DNS of the domain from the control panel. The mailserver shares the same IP address, so my typical DNS config is: www.mydomain.com ...
Marco Demaio's user avatar
3 votes
2 answers
5k views

How to add PTR record for a /16 IP block in BIND using $GENERATE directive?

I'm trying to reverse map a block of IP using PTR record to some special name so their usage can be easily reflected by a simple nslookup. For example, here's a nslookup result: # nslookup 172.17....
yegle's user avatar
  • 706
3 votes
1 answer
708 views

Best practices for managing the IP addresses you own in DNS and their PTRs?

I was wondering how exactly the big companies go about managing all the IP addresses that their public servers use, especially in respect to setting up correct PTR-records. This is very important, ...
Kevin F's user avatar
  • 31
3 votes
4 answers
9k views

DNS and PTR for SMTP: shared IPs and subdomains

This question is similar to others about PTR and DNS for SMTP, but one specific aspect was unanswered: what if one machine does SMTP and HTTP on the same IP address. For example: SMTP at mail.example....
Halfgaar's user avatar
  • 8,234
3 votes
1 answer
3k views

Who is responsible to set up reverse DNS (PTR) for a domain, the DNS host or the MX host?

I have the dns for a domain on GoDaddy and the MX configured for Gmail. All set up ok with spf, dkim and dmarc, and all passes all online tests, beside: intodns.com reports this error for the domain ...
jamacoe's user avatar
  • 201
3 votes
1 answer
2k views

Is having the same PTR hostname valid for multiple ip addresses? [duplicate]

Currently I have the following setup with two hostnames and two ips: cheeze1.mydomain.com IN A 123.123.123.111 111.123.123.123.in-addr.arpa IN PTR cheeze1.mydomain.com cheeze2.mydomain.com ...
dandan's user avatar
  • 158
3 votes
2 answers
6k views

Windows AD DNS is automatically adding PTR records for CNAMEs and I want this to stop

Preface: I am not a Windows admin. I am a Linux admin. I have a Windows 2016 server with AD DNS that handles internal DNS forward and reverse lookups. Somewhere, somehow, some process is ...
JDS's user avatar
  • 2,638
3 votes
1 answer
6k views

Why does SSH report "reverse mapping checking getaddrinfo failed" even when PTR record is set?

I'm trying to setup a cluster using a private network on subnet 10. One machine has two interfaces, one to connect to the regular network and the other to connect to all the nodes on subnet 10. This ...
Biggles's user avatar
  • 35
2 votes
2 answers
878 views

Reverse DNS in bind 9 failed and VPS

My Ip address is 1.2.3.4 (single ip for mail and dns server) and my domain name is example.com, I use Centos 7 and bind 9 output of command: `host 1.2.3.4` is: `Host 4.3.2.1.in-addr.arpa. not ...
Vahid's user avatar
  • 43
2 votes
3 answers
5k views

How to know if reverse PTR record is correct for emailing purposes

I send emails for [email protected] with my own server. When using dig -x xxx.xxx.xxx.xxx with the IP of my server, I get: ;; QUESTION SECTION: ;xxx.xxx.xxx.xxx.in-addr.arpa. IN PTR ;; ...
Basj's user avatar
  • 769
2 votes
1 answer
342 views

Is it possible to set a PTR record for Github Pages hosting?

Icelandic domains (.is) require that their domains support reverse DNS, which means configuring PTR records on the hosting server. Is it possible to set up a PTR record for GitHub Pages site hosting? ...
peteorpeter's user avatar
2 votes
2 answers
834 views

Configuring PTR records!

One of our client requires PTR records to be configured. Their ISP does not support the same. Can I create a PTR record on my name servers for an IP owned by a different ISP?
Prasad Asokan's user avatar
2 votes
1 answer
158 views

Reverse DNS record is not recognized

I have a problem creating a reverse DNS record. First of all, I have created a new zone. IP was aaa.bbb.ccc.ddd and Domain was ccc.bbb.aaa.in-addr.arpa. Second, I have edited the just created zone and ...
jstuardo's user avatar
  • 155
2 votes
1 answer
2k 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. 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.0.a.4.f.7.0.6....
user53029's user avatar
  • 649
2 votes
2 answers
8k views

PTR and A record must match?

RFC 1912 Section 2.1 states the following: Make sure your PTR and A records match. For every IP address, there should be a matching PTR record in the in-addr.arpa domain. If a host is multi-homed, (...
somecallmemike's user avatar
2 votes
1 answer
323 views

PTR record needed? Where?

I have a problem which I think can be resolved by adding a PTR record. Email isn't working for [email protected]. I looked up the SMTP issues on mxtoolbox.com which returned the following: SMTP ...
Jake Rowsell's user avatar
2 votes
1 answer
5k views

My ISP set up a PTR record for my mail server, but some places aren't seeing it

I have a VPS running Windows 2008 server with plesk 9, which I am using for email. I asked to my ISP to add a PTR record, which they did but my mails still droping into spam box. I have checked ...
Dali's user avatar
  • 23
2 votes
1 answer
131 views

$GENERATE'd records competing with real PTR records

I have a zone (1.168.192.IN-ADDR.ARPA) $GENERATEing PTR records from 1-254. However, I also have some custom PTR records, within that range, that are declared aside from the generate directive. ...
az_'s user avatar
  • 143

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