Stack Overflow
Stack Overflow

Questions tagged [reverse-dns]

Part of the the Domain Name System (DNS), a hierarchical naming system for discovering IP Addresses in relation to domain names. The Reverse DNS system takes an IP address and returns its configured domain name.

159 questions
1
vote
1 answer

JavaScript reverse DNS look-up

Is there a way to display the reverse DNS entry for someone visiting your page using only JavaScript? Or is the only way to do an AJAX request to a server that can do it?
Claudiu
  • 224,032
  • 165
  • 485
  • 680
1
vote
3 answers

Reverse dns using dns server of domain

I need to check a reverse dns using the DNS servers of some domains. But I'm having some problems. dig -x 212.26.146.21 +short mx20.gypost.com. all ok dig -x 212.26.146.21 @8.8.8.8 +short mx20.gypost.com. its ok too dig SOA google.com +short…
Kostiuk Aleksandr
  • 509
  • 2
  • 14
1
vote
1 answer

rDNS security of MySQL remote connections

Consider a MySQL server that accepts remote connections. What happens if you have a publicly facing MySQL server, and grant access to e.g.: 'sqluser'@'localhost' If an attacker now sets his rDNS to "localhost", will he able to access this…
Cedric VB
  • 222
  • 1
  • 7
1
vote
2 answers

How long does a reverse DNS lookup take?

How long should I expect a reverse lookup take? 100 milliseconds? 1 second? 10 second? 30 seconds? What's your experience? Why? We're debating adding a feature to our server software which would require a reverse DNS lookup each time a client…
HansA
  • 1,375
  • 2
  • 11
  • 19
1
vote
2 answers

Where is an IP Anycast Nameserver system implemented?

Ive been reading alot about nameserver the last days. For our websites we want to optimize the waiting time of the visitors that is caused by our namserver. I will have some questions about IP Anycast and the general function of the DNS. Let me…
zwieback86
  • 387
  • 3
  • 7
  • 14
1
vote
1 answer

Approaches to scan and fetch all DNS entries

I'd like to conduct a experiemnt and I need a full database of all DNS entries on the Internet. Is it practical to scan the Internet and fetch all DNS entries? What is the limitation: storage, time or network bandwidth? Any good approaches to start…
Mingwei Zhang
  • 663
  • 7
  • 15
1
vote
2 answers

Can we use Route 53 or any Managed DNS for Azure VM Virtual IP?

I have deployed application to Win Azure Virtual Machine. but when i try to send email, almost all S.M.T.P. rejects my Message or sends it to spam. i have set up SPF + DKIM + Dmarc on my domain. only one thing i suppose the problem should be is PTR…
Devson Technologies
  • 106
  • 1
  • 6
1
vote
1 answer

How to add RDNS if I have pointed multiple DNS to the server IP?

I have hosted 2 email servers in a single server. This server has only one public IP. I have 2 domain names let say mail.aaa.com and mail.bbb.com which is pointed to this server, let say 1.2.3.4. My internet service provider would not allow to add…
Yasiru G
  • 6,886
  • 6
  • 23
  • 43
1
vote
1 answer

how to crawl all wordpress pages

I want to crawl all the wordpress blogs. Is there any quick approach to list all the secondary domain names under wordpress.com? For example http://developer.wordpress.com/ If we can get the list of all secondary domain address, it should be easy…
user1660362
  • 19
  • 1
  • 2
0
votes
0 answers

Reverse DNS lookup NodeJS

Background: Hi all, I'm currently taking a deep dive into DNS and learning using NodeJS and I'm having trouble understanding why I cannot perform a reverse lookup on a local IP address using the dns.reverse() function. Details: Code: const dns =…
Richard Smith
  • 77
  • 7
0
votes
1 answer

Why client_hostname is filled while log_hostname=off?

I have to compare the postgresql server connection time with and without client_hostname resolution. A server is already running in the domain, which have log_hostname=on in postgresql.conf. So a reverse DNS lookup is used to get hostname from…
Youlounn
  • 23
  • 5
0
votes
2 answers

failed to dial to (wss:///subf1/40234): 502 Bad Gateway > websocket: bad handshake

OK, this 502 error is from something different than the other related articles here. first i managed to setup a v2ray system using ubuntu 22. I have a domain and a cloudflare account to set DNS for my domain and a 'sub' subdomain connected to my…
Burzum
  • 170
  • 2
  • 15
0
votes
1 answer

How do you detect Googlebot using reverse DNS lookup in .NET Core?

I tried adding the following one-liner to output the reverse DNS lookup: @System.Net.Dns.GetHostEntry(Request.HttpContext.Connection.RemoteIpAddress) But it only returns the GetHostEntry function output. I only need this oneliner to put in a…
Munchkin
  • 857
  • 5
  • 24
  • 51
0
votes
1 answer

SMTP Reverse DNS Mismatch issue

According to MXToolbox my server has a problem. Please review: https://mxtoolbox.com/SuperTool.aspx?action=smtp%3awebmaus.net&run=toolpage The tool shows a 'SMTP Reverse DNS Mismatch' and I don't have an idea why. My PTR Records look…
Dominik
  • 31
  • 5
0
votes
1 answer

Server not found in Kerberos database due to multiple DNS entries for single IP

There is a SharePoint which I'm accessing a file using REST API through Kerberos authentication , the problem is that the SharePoint where it is located has two DNS entries for a single IP, whenever it resolves to domain name 1, the API is getting…
Sai Chand M
  • 13
  • 6
1 2 3
…
10 11