What is a PTR Record? (reverse DNS)

Find out what a DNS PTR record is, how to do a reverse DNS lookup, and how PTR records help email deliverability.
Find more at tonyteaches.tech
Check out my vlog channel @TonyFlorida
#ptr #dns #rdns #reversedns

[@IPv6people]

In 2.26 you say 'pee tee ar', but you type 'prt', and the command works, but gives a non-fatal warning that 'prt' is not recognised

[@damnwhores]

I'm glad I am not the only one to notice that. Strangely, he didn't bother replying to this comment, even though it has the most likes.

[@Vichion]

when you type it wrong so many times, you make an ALIAS ;)

[@fernapiedade]

Straight out to the point. Amazing..

[@LeaFaye]

Thank u lord. very straight to the point. jeez these other videos sucked thank u for this.

[@JeremiahRamirez]

GREAT EXPLANATION! Thank you! Great video. I have come across your videos and you have a new subscriber!

[@TonyTeachesTech]

Appreciate you for subscribing Jeremiah!

[@smfarhan2754]

Thanks 👍 it's best description

[@adityaarsharmapersonal]

Something New! Thank you 😋

[@TonyTeachesTech]

Sure thing Aditya :)

[@rajkane2533]

Thanks, this cleared up a lot of things for me

[@TonyTeachesTech]

You're welcome Raj!

[@RWC482]

Great job. Very informative

[@TonyTeachesTech]

Glad it was helpful!

[@marc_things]

Do you have a video for the CNAME workaround if my ISP won't add?

[@felipedeoliveiraalmeida7493]

Thaks, Tony.

[@bharathreddis]

Thanks for clear and crisp information bro, need support from you pls. We have hosted in GoDaddy our domains and we have a requirement now to have PTR record for our email server for which GoDaddy says they don’t have option to enter ptr records in their panel. However they asked us to give a try with TXT entry for ptr record. After adding txt in our GoDaddy panel, still we see there is no ptr record for our domain. FYI, we have procured the public IPs from IRINN and IRINN says they don’t do any PTR entries at their end. Can you guide in this case pls.

[@szabojanos4410]

Thank you Dear Tony! A record is OK, CNAME is OK, PTR record is OK. If you have got free time can you make video for HSTS, and DNSSEC DS record? Thank You!

[@TonyTeachesTech]

I will add it to my list!

[@zanatos2000]

Thanks for the concise and clear explanation Tony, quick question, does it make sense to have a PTR Record for every public IP address?. For example, my internet service provider gives me a /29 public block for my usage, besides email server, what other use cases would require a PTR record?

[@TonyTeachesTech]

I don't think it makes sense to have a PTR record for each IP unless you have a reason for it

[@ekambaramsainikhil9301]

can you please explain what are the chances that doesn't match match the ip and gets denied and how do spammers try to spam and the how does the reverse lookup take action on it and I am tired of searching this over the internet

[@TonyTeachesTech]

I would image that spammers create a PTR record for an IP address that they have access to that points to a domain that they don't own. When the email server does the PTR lookup, it finds a mismatch and deems the content as spam

[@joshuadelacruz3907]

wow! mac does auto-correction of commands? is that PTR or really PRT?

[@attilamuhi]

And the actual PTR record, is it stored as a txt record? The contents of it, is it enough to copy that line you showed from the dig command?

[@peakminute]

there is one little problem with PRT outlook and hotmai even yahoo often sends email to spam folder even all other records like spf, dkim and dmarc are fine configured. Also one server an have only one PTR record and this is a downside, coz if you host several websites on one server you can associate IP to several domains in this case... What are your thoughts @Tony

[@TonyTeachesTech]

Yeah unfortunately if Outlook (or another email server) has blacklisted the IP address of your email server, then you're out of luck even if it's a different domain name

[@peakminute]

@@TonyTeachesTech I mean not a blacklist. but when PTR does not match,- this is the reason email lands to spam folder or is rejected.

[@TonyTeachesTech]

@@peakminute Right right

[@jaymehta199]

Any attack can be possible through PTR records, if attacker can get the PTR records ???

[@TonyTeachesTech]

With access to your PTR records, I would imagine a hacker could do some malicious things like spoofing

[@ahmedallali5327]

Heyy Tony, I have sent 1450 emails to just find out that all those emails went to spam. When I checked in Mxtoolbox I found that it is listed in UCEPROTECTL2 UCEPROTECTL3..... and when I click on details it takes me to a page I can see this written in red color:
WARNING: No Reverse-DNS (PTR) is assigned to your IP
Please request your Admin or Provider to fix this.
My email is hosted on Namecheap.
Can that be the reason me emails go to spam and how to fix that? THANK YOU SO MUCH