• IP addresses correspond (pretty roughly) to a single machine
• There are two standards for IP addresses: IPv4 and IPv6
• Generally look something like a collection of 4 numbers 0-255 for IPv4
• Most IP addresses could correspond to a machine on the internet (public IP)
• Some IPs correspond to "private networks"
• These private IPs get reused all over the place (in private networks)
• You probably have a private IP address and your whole household probably shares a public IP
• You need a public IP to host a web site

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