There is a wifi network with 5 computers. When one of these computers request a URL from internet, Can ISP know the MAC Address of the computer that made request or phone's IMEI number? Are these informations sent from router to ISP in IP packets?
Wireless – SP know computer MAC address in local network
ispmac addresswireless
Related Solutions
You should search for the OSI model:
A full explanation of the OSI model is too broad to give here, but applications like browsers and web servers use the transport layer to communicate with each other, not the network layer where IP addresses are.
What you are missing is that HTTP uses TCP as the transport protocol. By default HTTP servers listen on TCP port 80. A host using a browser will use a random, ephemeral, TCP port as its source port. NAT will do something similar for each host for which it translates the IP address, and it keeps track of which port is assigned to which host in a traffic flow. It ends up being a combination of layer-3 address (e.g. IP address), transport protocol (e.g. TCP), and layer-4 address (e.g. TCP port) for what gets used as a unique identifier.
Getting a MAC address requires the ability to get broadcast traffic.
ARP is a broadcast protocol and is therefore only available on a LAN.
Once traffic is routed you are unable to get the MAC address as it is stripped from the packet once it crosses the boundary of a router/L3 device.
Switches have a MAC table. Routers have a routing table, in general.
You can only get MAC addresses from a LAN.
Best Answer
A mac address doesn't make it past the first hop (most likely your home router). It stays local to the broadcast network.
IMEI isn't transmitted over wifi, so your ISP will also not see your IMEI. Your cell provider definitely sees it though.