How do IP addresses work? Does the IP address vary from computer to computer, or does it depend on the internet connection you're using? If I use my neighbour's Wi-Fi from my computer, does that change my IP address?
If you connect to a router, the router has one IP address and it allocates other local addresses to the devices connected to it to recognize them. But all the devices connected to that router have a common IP. The local address is just for the router to easily identify which device asked for which website.For eg: You have your mobile and laptop connected to the router.Say your router has an IP of 10.10.10.10and the router has assigned local ip of 192.168.0.100 - Mobile.192.168.0.101 - Laptop.If you go to http://www.whatismyipaddress.com from both the devices you'll see 10.10.10.10 and not 192.168.0.100 or 192.168.0.101 because local ip addresses are not used anywhere outside your network.So what happens when you go to a website? Well, say you entered:http://google.com in mobileandhttp://quora.com in laptop.Your router will then send a request for google and quora by the address of 10.10.10.10. The webservers of google and quora will then get a message that 10.10.10.10 wants your webpage and as a server usually does, it'll respond and give it to the router which asked for it (i.e. your router).Your router now has google and quora's webpage. It'll then see which local ip address asked for which website. Router maintains a table which keeps track of the MAC address and local IP address assigned to them. It then realizes your mobile asked for google and laptop asked for quora and will deliver it to them.How ever if you have 2 different LAN connections of 2 different ISP (Internet Service Providers) going in 2 different laptops they'll have 2 different IP addresses. But when you use a router, it performs what we call as NATing or (Network Address Translation). If you want to learn this is detail you can check: http://www.geekstarts.info/netwo... or http://www.geekstarts.info/router/.
If someone deleted their Facebook Messenger app can they still receive messages?
Yes, if someone has deleted Facebook Messenger, he can still receive messages if he is logged into it's mobile's browser. By the way if we send message to someone, he surely get message after logging in to his account even if he has not logged in to his account since long time. Because Facebook store recent activity in it's database till the deletion of account.Hope it helps!I do not know if Facebook stores all messages indefinitely. For years, ? It could be a tremendous amount of data. Much of which if most likely useless.