47

You have Data Saver turned on in the settings of Google Chrome. It proxies all your HTTP (not HTTPS or incognito) traffic through an optimisation server at Google to make the pages smaller.


42

Traceroute sends packets to the destination with the field "time to live" (TTL) equal to the number of hops. Every router decreases the value of TTL of an incoming packet and if it sees an incoming packet with TTL = 0 then drops it, otherwise it decreases the value and sends it further. At the same time it sends diagnosing information to the source about ...


32

Note that the website that is reached through a domain name might not be hosted directly at the root of the IP address, i.e. example.org could map to 123.45.67.89/~example. This is common for normal web hosts since they can't allocate an IP address per website – that would be incredibly wasteful. For instance, if you do a DNS lookup of webmasters....


31

It should be noted that the following list has not been updated since November 2014. The following browsers do support SNI: Internet Explorer 7 or newer, on Windows Vista or newer. Mozilla Firefox 2.0 or later Opera 8.0 or newer (TLS 1.1 protocol needs to be enabled) Opera Mobile with at least version 10.1 bèta on Android Google Chrome (Vista or newer. XP ...


17

I have had server IP's blacklisted by Microsoft a few times and I have had them removed reasonably quickly. I noticed that after entering and joining anti spam related services that they recommend it was faster and easier. I recommend that you ensure that you can reply Yes to the below questions (except the last one) in the web form where you ask for ...


16

Another reason is that typically 3 packets are sent to each machine, and some machines will only respond to the first packet no matter what. If the problem is just a timeout issue, you can set the -w parameter to the number of seconds you want to wait; e.g., traceroute -w 10 google.com will wait 10 seconds instead of the default of 5 seconds. Note: Some ...


14

Just like with visitors, search engine bots go wherever the domain and links in your site point to, and index links according to which belong to your site, independent of the IP address it's hosted on. So changing IP addresses is just like doing a 301 redirect (without the redirect) - it won't affect your search engine results or position. Two potential ...


14

DNS has no concept of ports. DNS only points to the IP address. The port to connect to for a particular service is determined by convention. For example the default port for HTTP is 80 and the default port for SSH is 22. The only way to override the default port is to specify it in the URL (or on the command line for something like SSH). There is no ...


13

Yes - altering a HOSTS file locally to redirect a domain to an IP isn't the same as simply typing in that IP into the browser. The reason why is that in shared hosting, one IP address houses multiple domains. When you type in that IP address of "your" site (which is also the IP of other sites as well), the server can either a) Give an error b/c it doesn't ...


11

When you buy a SSL certificate, it is not tied to any particular IP address. It can be used on any server that hosts the content for that domain name. I personally have a load balancer on my website with multiple servers behind it. I have the same certificate installed on each of the web servers that are behind the load balancer. Each of those servers has ...


9

In the context of web hosting, a shared IP is an IP address shared by multiple websites usually on the same shared server but could also be across different servers, whereas a dedicated IP gives your website a distinct IP from others. If you don't know whether you need a dedicated IP or not, then you most-likely don't need one. The primary reason one uses a ...


9

After reading Christofian's answer, I did some research and found out that the five Regional Internet Registry members (APNIC, AFRINIC, ARIN, RIPE, and LACNIC) each maintain a copy of the allocated IP address ranges and the associated countries on their public FTP servers. This information is updated daily and mirrored between the five servers. For example, ...


9

The original version of HTTP did not include any mechanism for the client to specify the host name as part of the request. It connected to the server and sent only the path portion of the URL. One of the early modifications to the HTTP protocol was to add the ability for the client to send other "header" information, including the host name. 20 years ...


9

The answers so far write about name servers and DNS as though they were two different things. They aren't. A DNS server is a name server. There are other name services, e.g. Corba's COSNaming, the RPC Portmapper, the Java RMI Registry, etc., but the DNS is what is usually meant. Also contrary to what is stated in other answers, the DNS contains the DNS ...


8

While its not bad advice from the SEO company I do feel its a little incomplete, there's a tag that you can use on your pages to avoid duplicates finding their way into the index of search engines such as Google. Better Advice The better advice from the SEO company would be to ensure that your using Rel Canonical on your pages so no pages ever end up in ...


8

The questioner is asking to know why he can't use one IP address for two nameservers, but in fact he can use the same IP for both. This is often done for servers with only one IP address available to it. Having a second IP address on the same server is of little benefit, since if that server goes down, both IP addresses will be unreachable. The only ...


8

Hotmail, which is operated under Outlook.com now, is provided by Microsoft. You can request they remove your IP address by completing the form here (this may require signing up for Outlook.com first). It will take a few days for them to investigate the report, and if your IP address was not associated with sending Spam, you'll receive an email back from ...


8

BOTS, CRAWLERS and SCRAPERS use IP addresses in blocks, its rare to see one that will use the same IP address over and over. IP blocks are often sold, brought and then sold again! some of these blocks will resolve, some will not depending on the setup they use, because of this banning IP from a resolve is useless, because you risk banning real users, using ...


7

If they're really pointing their DNS records to your IP address (and your webserver is configured so that this actually shows your site's content on their domain; see Lazy Badger's answer), then you can stop this sort of "DNS hotlinking" with a simple mod_rewrite rule: RewriteCond %{HTTP_HOST} otherdomain\.st$ [NC] RewriteRule ^ - [F] This will return a ...


7

This means that every page on my website is actually accessible from another domain. Any owner of domain can add in managed domain IN A|IN CNAME record, which will point to any IP in the Net, but if you're using name-based virtual hosts, then your site will likely¹ only be accessible via the hostname specified in the ServerName and ServerAlias directives. ...


7

Especially if you have a shared hosting or a server of your own hosting multiple domains you can't access the "website" via IP. For your own server you could possibly define a primary domain that is reached if you enter the IP. For shared hosts that is impossible. As mentioned by @Ijacqu the IP could easily change. Another thing is duplicate content, so ...


7

I deal with this type of situation using my virtual host configuration. Under Apache, the first virtual host is the "default" virtual host. I configure it to serve a 404 error with the message 404 Not Found -- Hostname Not Recognized This server is not configured to serve documents for foo.example.com Then I create specific virtual hosts for each ...


7

From the official docs to verify Googlebot / Google: Note that Google does not recommend using a static "whitelist". You can verify if a web crawler accessing your server really is Googlebot (or another Google user-agent). This is useful if you're concerned that spammers or other troublemakers are accessing your site while claiming to be Googlebot. ...


7

I think in order to clarify what is going on it helps to have an overview. The first thing to keep in mind is the internet runs on IP addresses, but people would rather remember words (domains) than numbers. This is a key problem that DNS is trying to solve. Another thing this lets you do is to change your server's IP transparently. This is great for ...


6

I want to change language dynamically by using PHP code,this done based on the requesting IP address. Please avoid automatic language detection based upon origin IP or, if you insist upon using this technique, make it easy for users to select a different language - you will inevitably find that some of your users' IP addresses do not accurately indicate ...


6

Regarding your second question: ::1 is localhost in ipv6. Regarding your third question: # Mark requests for the robots.txt file SetEnvIf Request_Method "^OPTIONS$" dontlog # Log what remains CustomLog logs/custom.log common env=!dontlog see also http://httpd.apache.org/docs/2.4/logs.html#accesslog


6

In 000-default (usually in /etc/apache2/sites-enabled/000-default) You can use the VirtualHost tag to separate different sites. <VirtualHost *:80> DocumentRoot /var/www/example1 ServerName www1.example.com </VirtualHost> <VirtualHost *:80> DocumentRoot /var/www/example2 ServerName www2.example.com </VirtualHost>


6

As long as the domain and content remains the same, changing IP addresses should have not affect on SEO. Moving from Canadian to US IP's wont affect your SEO. The only potential gotcha could be if somehow the IP address has been backlisted due to spam or other misuse, although this is more commonly, but not exclusively, an issue with Email than Web Domains. ...


6

For years, I haven't seen a site ranking in Google that doesn't have a domain name. That doesn't mean it isn't possible, but few (if any) sites are doing that now. Here are a bunch of reasons that you should get a domain name: IP addresses cannot be moved from one web host to another the way that domain names can. IP Addresses change. It is very ...


6

Although both the IP address and domain might lead to the same content at any given moment, the content for each was likely indexed on different dates. Note the differences in the snippet for the IP address, which starts with "5 days ago", versus the snippet for the domain. It looks like much of the content there is dynamic and changes frequently, as other ...


Only top voted, non community-wiki answers of a minimum length are eligible