A domain name is an identification string that defines a realm of administrative autonomy, authority, or control on the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Technically, any name registered in the DNS is a domain name.

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43
votes
4answers
9k views

Is publishing your public IP address a security threat?

I work for a large-ish company (thousands of employees across multiple locations). I recently needed to know what the possible public IP addresses are, so that a vendor could identify us (presumably ...
17
votes
5answers
27k views

How can I find subdomains of a site?

One of the things I need to do from time to time is to find subdomains of a site for example. Starting with example.com sub1.example.com other.example.com another.example.com I'm ...
3
votes
2answers
742 views

How can I protect my domain names without exposing too much personal information?

I guess more specifically I want to know how to ensure I retain ownership by having sufficient contact information in the Administrative, Technical and Billing contact fields, but without exposing too ...
24
votes
3answers
963 views

What are some risks of purchasing a “used” domain name

If you purchase an existing domain name that was already used by someone else what are the ways in which the domain could have been broken by the previous owner? Are such problems common and are there ...
4
votes
3answers
1k views

How do you verify a certificate belongs to a domain?

I'm using PHP and trying to verify a SSL certificate belongs to the SMTP domain/IP I'm connecting to. Currently I can verify the certificate is valid using the following code $resource = fsockopen( ...
14
votes
3answers
278 views

Domain name expiration and TLS

If I purchase a domain name that has expired, do I have any assurance that the previous owner does not have a valid HTTPS certificate for the site? In other words, do CAs check domain name expiration ...
10
votes
1answer
554 views

Why can the validity of an SSL certificate exceed the registration period of a domain?

I can understand why one might desire to purchase a certificate for multiple years but I am left wondering why it appears to be possible to obtain a valid certificate for a domain that may have come ...
28
votes
3answers
16k views

How do hacking groups register domains remaining anonymous?

Let's take lulzsec as an example; they registered lulzsecurity.com. There are two problems that I don't understand how they solved: They had to pay for it. Tracking down money is generally much ...
2
votes
2answers
309 views

Domain and IP scoring

What kind of things would you check in a domain and IP scoring system? Which things are the most important? If I have a web site or web service, I would like to figure out a score for my visitor. If ...
4
votes
3answers
2k views

Keeping Whois domain registration details private

Most domain registers offer a service to keep your details private in the Whois database. Usually this works by replacing your email, telephone and snailmail addresses with proxies or P.O. Box ...
3
votes
1answer
273 views

How to protect against exploitation of email addresses from an mistakenly expired domain?

I have a domain name that I have registered for a long time. Due to a combination of bad luck and oversight, the domain name expired and was rebought by somebody else. I am attempting to buy the ...
9
votes
3answers
4k views

If someone bought the .local TLD could that be a security risk?

Now that the ICANN is allowing custom Top Level Domain names and often corporate IT workers like to use .local as the TLD for internal networks, if someone does buy the .local TLD what are some ...
7
votes
1answer
225 views

Does dnssec protect against malicious registrars?

With the recent conspiracy theories around the registrar MarkMonitor Inc., the question arises, if DNSSEC protects against a registrar going malicious (or being attacked). This is especially ...
6
votes
2answers
9k views

Malicious users trying to create yahoo accounts with random emails at my domain?

Recently, I have been getting a string of emails from yahoo with people trying to create accounts or add email addresses @mydomain.tld to their account. I was wondering if anyone else has seen this ...
10
votes
2answers
358 views

How to protect against exploitation using a lapsed domain

Consider a domain that had been in active use for some time but is no longer desired — perhaps the company is out of business or a name change took place years ago, or whatever. The domain ...
-2
votes
1answer
464 views

How does DNS work?

I'm learning pentesting from books. So far I thought I know about DNS but now I'm completely lost and confused. well, I know what happens when you enter domain name in your browser: Say, I've ...
0
votes
1answer
256 views

Can we protect domain name by law? [closed]

Some company have domain names worth a million dollar. But sometime they are lost to hackers. So I wonder how can we protect domains by law instead of technology?