IP PúblicaRedes
What is a public IP address?
A globally unique numerical identifier assigned to your router gateway by an Internet Service Provider (ISP), enabling packet routing across the public Internet.
NETWORKING & IP CONNECTIVITY
My Public IP & Geo Location
Your public IP address, internet provider, approximate location and time zone — how the rest of the web sees you.
Your IP address
Looking up your IP…
Public IP Architecture & Global BGP Routing
GeoIP databases, Autonomous System Numbers (ASN), IPv4/IPv6 transition, and web privacy.
What is a Public IP Address?
A public IP is the unique global numeric identifier leased to your modem/router by your Internet Service Provider (ISP). Web servers require it to route requested data packets back to your connection.
How GeoIP Geolocation Works
IPs do not have GPS. Geolocation is inferred through databases cross-referencing Regional Internet Registries (RIRs like ARIN/RIPE/LACNIC) and ISP distribution hubs.
Autonomous Systems (ASN) & BGP
Telecom providers control Autonomous Systems designated by ASNs (e.g. AS15169 Google, AS13335 Cloudflare). BGP exchanges route reachability across optical backbones.
Dynamic vs Static Public IPs
Residential connections typically receive dynamic IPs that cycle periodically upon modem reboot, whereas business servers lease fixed static IPs.
Public IP & External Connectivity Troubleshooting
Fixes for incorrect location, blacklisted IP blocks, and VPN leaks.
Issue 1
GeoIP Location Shows the Wrong City or Region
⚡ Quick Fix:Normal behavior if your ISP routes traffic through a regional core gateway. Power cycle your router to grab a different IP range.
🔧 Technical Fix:Submit a geolocation correction ticket directly to GeoIP providers (MaxMind GeoIP2 / IPinfo) with your ISP central office postal code.
Issue 2
Endless Captchas, Blocked Websites or Blacklisted IP
⚡ Quick Fix:Keep your modem powered off for 10 minutes to force the ISP DHCP lease to expire and assign a clean IP.
🔧 Technical Fix:Check Spamhaus/MXToolbox blacklist status. If behind CGNAT (shared IP with thousands), contact ISP to request a public dynamic/static IP.
Issue 3
Dynamic IP Changes Break Remote Access & Home Servers
⚡ Quick Fix:Use modern mesh VPNs/tunnels like Tailscale, ZeroTier or Cloudflare Tunnels which don't require static IPs or port forwarding.
🔧 Technical Fix:Configure a DDNS client (DuckDNS / No-IP / Cloudflare API) on your router to automatically update DNS A records whenever your IP changes.
Issue 4
VPN IP Leak / WebRTC Exposing Real Public IP
⚡ Quick Fix:Enable 'Kill Switch' and 'DNS Leak Protection' inside your VPN client settings.
🔧 Technical Fix:In Firefox set `media.peerconnection.enabled = false` in `about:config` or install WebRTC leak blocker extensions in Chromium browsers.
Did You Know? Public IP Facts
Fascinating facts about 1.1.1.1 Anycast, multi-million dollar IPv4 auctions, and IPv6 scale.
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1.1.1.1 & The Magic of Anycast Routing
Cloudflare's 1.1.1.1 isn't a single computer. Through BGP Anycast, hundreds of edge datacenters worldwide broadcast the same IP, routing queries to your nearest facility.
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IPv4 Address Blocks Sold for Hundreds of Millions
Following official IPv4 depletion in 2019, tech giants like Amazon and Microsoft have spent billions purchasing legacy blocks at over $50 per individual IP address.
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IPv6: 340 Undecillion Addresses in the Universe
The 128-bit IPv6 space provides 3.4 × 10^38 addresses—enough to assign trillions of unique IPs to every single grain of sand on Earth.
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The Very First Packet on ARPANET (1969)
On October 29, 1969, UCLA tried sending the word 'LOGIN' to Stanford. The network crashed after sending 'L' and 'O'—making 'LO' the first message transmitted in Internet history.
IP Protocol & WAN Routing Glossary
Learn the fundamental concepts, protocols, and technical terminology of this tool.
IPv4 vs IPv6Protocolo
What is the difference between IPv4 and IPv6?
IPv4 operates on a 32-bit address space (4.29 billion nodes); IPv6 expands this to 128 bits in hexadecimal format, providing 340 undecillion global addresses.
Sistema Autónomo (ASN)Infraestructura
What is an Autonomous System Number (ASN)?
A globally unique identifier allocated by IANA to large network blocks and telecommunications operators communicating via the Border Gateway Protocol (BGP).
Carrier-Grade NAT (CGNAT)Enrutamiento
What is Carrier-Grade NAT (CGNAT)?
An ISP edge routing architecture where multiple residential subscribers share a single WAN IPv4 address, preventing incoming port forwarding mappings.