Plain-language guides to public and private IP addresses, geolocation, ISPs, ASNs, and address privacy.
The IP address a website sees is your connection's public address at the router — not the same as any address your own devices use on your home or office network.
Private IP addresses only work inside your own network; your router translates them to one shared public IP address the moment traffic leaves for the internet.
An IPv4 address is four numbers between 0 and 255, and its limited size — not any flaw in the design — is the reason NAT and IPv6 both exist.
IP geolocation is built from network registration records, routing data and commercial observation, not GPS — which is exactly why it's reliable at the country level and much less so for a specific city.
An IP address can point to your approximate network region — typically country-level, sometimes city-level — but it cannot reveal a precise street address or pinpoint you personally.
Whether your IP address stays the same or changes over time comes down to one setting at your ISP — and it has real consequences for hosting, remote access and how consistently your connection is classified.
Your public IP is the same across every device on one network and easiest to check via a dedicated lookup; your local IP is per-device and found in your operating system's own network settings.
Class A, B and C address ranges were the internet's original allocation system — mostly retired in favor of CIDR, but still useful context for reading how address blocks are described.
A public IP lookup can reliably tell you country, network owner and general risk classification — but it cannot identify a specific person, confirm intent, or replace verification for anything consequential.
A wrong IP location almost always traces back to one of a handful of causes — stale provider databases, ISP gateway routing, a VPN, or mobile carrier networking — each with a different, checkable fix.
Your ISP is the company that sells you internet access; the ASN is the numeric identifier for the network actually announcing your address's route on the internet — and the two aren't always the same organization.
A residential IP address is one allocated by an ISP directly to a home internet subscriber — a classification based on network registration, not on how trustworthy the connection actually is.