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Understand your IP, plainly.

Practical, honest explainers across 71 topics — from “why is my location wrong” to reverse-DNS, blocklists, VPN leaks and bulk audits. No fear-mongering, no affiliate-bait. New guides are added regularly.

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Is it dangerous to share my IP address?What your public IP really exposes, the actual risks, and what's just scare-marketing. How to hide my IP addressThe practical ways to change the IP sites see — VPN, Tor, proxy — and their trade-offs. Static vs dynamic IP, explainedThe difference, how to tell which you have, and when a static IP is worth it. IPv4 vs IPv6 explainedWhy two addressing systems exist, how they differ, and what it means for you. How to choose a VPN (without the hype)What actually matters when picking a VPN, and how to cut through paid reviews.

Public IP & location

Why does my IP show the wrong location or city?What IP geolocation actually measures, why the city is often wrong, and when that matters. Find your public IP for a Minecraft or Palworld serverGetting and using your public IP to host a game server friends can join. Can someone hack your router or home network with your IP?What an attacker can and can't do with your IP, and the realistic risks to a home network. Does incognito mode hide your public IP?What private browsing really does — and why it doesn't change the IP sites see. Change your mobile IP instantly with airplane modeWhy toggling flight mode often gives you a fresh mobile IP, and when it won't. Why am I getting an IPv6 address only?Troubleshooting dual-stack mobile and fiber connections that show IPv6 but not IPv4. What is a non-routable IP address range?Reserved private ranges versus public routing, and why some addresses never reach the internet. Fix the “Your IP has changed” streaming account lockWhy streaming services flag IP changes and how to resolve the lockout. Configure Dynamic DNS to map a domain to your changing home IPUsing DDNS so a hostname always points at your dynamic home IP for remote access. How to find your router's IP and log in (192.168.1.1)Find your default gateway, open the admin page, and sign in safely — without guessing default passwords.

Blacklists & IP reputation

How to check if your IP is blacklisted (and fix it)Finding out whether your IP is on a blocklist and the steps to get delisted. Why is my IP blocked by Google reCAPTCHA?What triggers “unusual traffic” challenges and how to clear them. Remove your server IP from SpamhausA step-by-step guide to diagnosing the listing and requesting delisting. How residential IPs end up on spam registriesWhy home IPs get listed, what it means, and how to check yours. Bad IP reputation on shared hosting, and how to audit itHow a neighbour's behaviour affects your shared IP, and how to assess the damage. What is an IP threat / trust score?How firewalls like Cloudflare and Akamai score an IP's reputation, and what feeds the score. Datacenter proxy blocklists vs residential trafficWhy hosting and datacenter IPs get blocked more, and how that differs from home connections. Trace abuse contacts with WHOIS to report attacking IPsReading registry abuse records to report malicious traffic to the right network owner.

VPN, WebRTC & privacy leaks

What is a WebRTC leak?How your browser can expose your real IP past a VPN, and how to confirm you're sealed. Disable WebRTC in Chrome, Brave & EdgeBrowser-by-browser steps to stop WebRTC from leaking your IP. Stop IP leaks in Firefox via about:configChanging the media settings in Firefox to prevent WebRTC from revealing your address. Audit your VPN kill switch for packet leaksTesting whether your VPN actually blocks traffic when the tunnel drops. Identify an IP leak: DNS, WebRTC & IPv6A full self-audit of the three pipelines that most often leak your real IP. What is canvas fingerprinting?How sites identify your device even when your IP is hidden, and what reduces it. Does iCloud Private Relay fully mask your IP?What Apple's Private Relay hides, what it doesn't, and how it behaves on public Wi-Fi. SOCKS5 vs HTTPS proxiesWhich proxy type conceals your connection protocol, and the trade-offs of each. Does Tor completely scrub your identity?How onion routing hides your public IP, its limits, and why speeds drop. Why proxies can still leak your true ISP / ASNHow residential and SOCKS5 proxies sometimes expose the real carrier behind them.

Reverse DNS & email deliverability

What is a PTR record? Reverse DNS for mail serversWhy mail servers need reverse DNS and how a PTR record is set up. Reverse DNS lookup in Windows, Linux & macOSThe exact terminal commands to resolve an IP back to its hostname on each OS. Fix “Forward-Confirmed Reverse DNS missing” errorsWhat FCrDNS is, why mail systems require it, and how to align the records. How reverse DNS reveals company hostnames in trafficUsing rDNS to identify the organisations behind visits to your site. A records vs PTR recordsThe difference between forward and reverse DNS mappings and when each is used. Configure a PTR record in your hosting control panelStep-by-step setup of reverse DNS in common cloud and hosting panels. SPF, DKIM, DMARC failures from misaligned reverse DNSHow broken rDNS breaks email authentication, and how to fix the alignment. How to set up SPF, DKIM & DMARC recordsA beginner-friendly walkthrough of creating SPF, DKIM, and DMARC records and rolling DMARC out safely. Trace reverse mapping with nslookup and dig -xUsing diagnostic commands to follow the reverse-DNS chain for any address.

Bulk audits & log analysis

Audit multiple IPs efficiently from server logsTracing and checking many addresses at once when reviewing access logs. Extract and block abusive ASN networks from access logsFinding the networks behind abusive traffic and blocking them at the source. Map geolocation and carrier profiles across 100+ IPsScaling location and ISP lookups across large lists of addresses. Run bulk health checks on a proxy list before scrapingValidating proxies for blacklist status and reachability ahead of a scrape. Whitelist corporate IP ranges with CIDR blocksTurning lists of addresses into clean CIDR ranges for firewall and access rules. Extract unique IPs from Nginx, Apache & IIS logsTerminal one-liners to pull and de-duplicate addresses from raw access logs. Group botnet attacks with bulk ASN auditsRunning autonomous-system lookups across many IPs to cluster coordinated attacks. Build a Python script to audit geolocation & blacklist at scaleAsynchronously checking hundreds of targets for location and blocklist status.

Static, dynamic & DHCP

Is your home IP static or dynamic? A simple testA quick visual way to tell whether your address is fixed or changing. Why does your public IP keep changing? DHCP leases explainedHow DHCP lease times control when your address rotates. Ephemeral vs elastic IPs on AWS, Azure & Google CloudHow cloud platforms assign public addresses and what survives a reboot. Fix “Strict NAT Type” on PS5 and Xbox Series XUsing port forwarding and IP settings to open up your console's NAT. Console local IP vs public IP for port mappingFinding the right address on your console for router port-forwarding. Why does my IP start with 169.254? (APIPA fix)What a 169.254 link-local address means — your device can’t reach the router — and how to fix it.

Hosting, servers & developer

Find a website's real origin IP behind CloudflareWhy a CDN hides the origin, and the limits of trying to uncover it. What is an anycast IP address?How CDNs announce one address from many locations to route requests to the nearest. Bind a Node.js or Python app to a local loopback IPServing an app on 127.0.0.1 and what that means for access and security. Understanding CIDR notation (/24, /32 and beyond)Reading and blocking subnet ranges, with worked examples. Configure a split-tunnel VPN for corporate + local accessRouting work traffic through the VPN while keeping local network access. Why can't I access my company portal? Static IP whitelistingHow corporate IP allow-lists work and why your changing home IP gets blocked. What is a residential proxy?The difference between consumer VPNs and commercial residential IPs, and the legal line.

Threat intelligence & diagnostics

Check if your IP is used in a malicious botnet registryHow to tell whether your address has been flagged for coordinated abuse. Whitelist an IP in Windows Defender and third-party firewallsAllowing a trusted address through local firewall rules safely. Why your ping spikes while your speed test looks healthyHow latency and jitter cause lag even when raw bandwidth is fine. What is a DDoS-protected IP for game servers?How game hosts mask origins to absorb attacks, and what it means for players. Shared vs dedicated IP for gamingWhether a unique address actually lowers in-game jitter. High risk or false positive? How payment gateways judge your IPWhy a geolocation mismatch can flag a transaction, and what to do about it. Are my ports open or exposed? How to check safelyWhat port exposure really means, why your localhost isn't public, and how to check your own ports honestly. How to run a traceroute (and read the results)Trace the network path from your own connection to any server, step by step, on Windows, Mac, or Linux — and understand what each hop means.
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