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I'm developing a Web service using a VM behind a firewall on a University. I need to know what a range of IP address to give to our IT guy so we can get access to calls from foursquare.
You'll never be able to reliably pin this down. It's not as if they are using one subnet.
Your IT guy needs to open up your firewall differently, based on your end, not Foursquare's.
Navigate to zoneedit.com in the DNS lookup field enter foursquare.com and in the dropdown select "Ip Address (A)" you will find only one record listed. After further research I found that Foursquare is hosted at Amazon Web Services and the most likely scenario is that thy will have have multiple servers hosted behind a single IP'ed load balancer. You will need to get the IPs for foursquare.co.uk or any other top level domains it may operate under (COM,NET,CO.UK and so on) but from what I can find CO.UK is the only other country it operates in.
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i was trying to scan ports with Nmap trough proxychains4 in order to be anonymous while scanning , but after i used wireshark to capture to traffics , i saw that my private IP didn't change and still the same
You capture traffic on your local machine so it should have your IP address as a source. Traffic should go from your IP to the proxy server, then from the proxy server to the target (it's where the IP address is changed). The problem exists only if the traffic goes directly to the target.
A part of the Nmap functionality is unavailable with proxychains. Here's a good link about it: https://www.1337pwn.com/using-nmap-with-proxychains-in-kali-linux/.
Also, some of the Nmap scan types are "aggressive" so it means you should have permission from the target. To better understand how Nmap works and have legal hands-on experience, use hacking platforms like TryHackMe, HackTheBox, or similar.
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Would that just be a reverse proxy? Is it even possible to hide a servers ip address with a public proxy? How would hiding the servers ip address work?
Services generally need to be in a fixed location as otherwise clients can't find them via DNS to connect to them. The servers that implement that service can of course be behind a proxy, which does indeed hide them as you say, and this is very common in load balancing configs. Whether that constitutes hiding their IP really depends what you're trying to achieve, since the balancer/front end is publicly visible, and very likely close to the back-end, in network terms.
If you want to hide the location of the service, rather than any of the collection of servers behind it, then you need to look at running a tor onion service, which resolves the location of the service in a way that doesn't reveal its IP, without using DNS in the usual way.
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I'm having some trouble understanding domain and mx records.
If I direct the domain name from the register to where I am hosting a site. And on the Register I direct the MX records to another server that takes care of the email will that work?
Yes, that's exactly what MX records are for.
Let's say, your domain is whatever.net.
You create A records for domains that you want to point to your website, i.e. www.whatever.net, whatever.net. They will point to the IP of your web server.
Then you set an MX record that points to a domain, typically something like mail.whatever.net.
You must then set up an A record for mail.whatever.net to point to the IP of your email server.
Note that your mail domain does not have to be a subdomain of your domain. It can also be something completely different. For instance many small businesses set their MX to mail.google.com and sign up with google to handle all of their emails.
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I am doing work on a server with a postgresql database from home, where I have a dynamic IP, so I use the no-ip ddns service to map my ip to a host name.
I want to edit the pg_hba.conf file so that I can get into the database from home (not setting it to all hosts), but it doesn't seem to work with the host name. Is there anyway to make it work?
This won't work, because the DNS name in pg_hba.conf needs to match the reverse DNS- IP-to-name- lookup result for your IP address: this is assigned by your connectivity provider, and ddns doesn't touch it (just provides an extra forward- name-to-IP- entry).
I believe this functionality was introduced in v9.1: http://www.postgresql.org/docs/9.1/interactive/auth-pg-hba-conf.html
If you're using a version prior to that, you could write a cron-fired shell script that does the DNS lookup and dynamically creates the pg_hba.conf file. (You might have to do a HUP after changing it, not sure off the top of my head.)
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I have set my MX record with Google
Mail, but google only provide 50 email
address for free is there any
possibility to create 50 email with
google and more with my own Web
hosting provider email server?
Unfortunately not. There's no way for MX records for a domain to distinguish between different addresses. However, if it's possible to create subdomain email addresses, you might be able to get away with creating a catch-all address in Google Apps and then setting filters to forward mail appropriately.
However, I think your best solution would really be to start paying for Google Apps if you're using it so extensively. Definitely worth it.