Knowledge hub · 65 guides
IP Lookup, Geolocation, and Security Guides
Practical articles for people searching their IP address and for site owners checking IP location, fraud risk, VPN usage, and reputation signals.
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65 guides
IP lookup essentials
10 guidesSubnet and CIDR Basics for IP Range Lookups
CIDR notation such as 203.0.113.0/24 describes a range of addresses. How to read it, and why security teams block or allow networks rather than single IPs.
· 7 min readWhy Does a Website Show the Wrong IP Address?
Troubleshoot why websites may show a different IP than expected, including VPNs, proxies, NAT, mobile networks, and IPv6.
· 7 min readResidential Proxy Detection for Login Risk: How to Spot and Block Suspicious IPs
Residential proxies make attack traffic look like home users. The signals that still give them away, and how to use them in login risk decisions without false positives.
· 8 min readWhat Information Can People See From Your IP Address?
Your IP reveals an ISP, an approximate area and whether you use a VPN or proxy. It does not reveal your name or street. What is exposed, and to whom.
· 6 min readX-Forwarded-For Header: How to Get the Real Client IP Behind a Proxy
X-Forwarded-For carries the client address through proxies and CDNs, and anyone can forge it. How to read it safely from a trusted hop and get the real client IP.
· 3 min readHow to Find Someone's IP Address: A Simple Guide
Where IP addresses legitimately show up (email headers, server logs, game hosts), how to look one up, and the limits of what the result can tell you.
· 5 min readHow to Choose an IP Geolocation API: Three Practical Approaches
Three ways to evaluate an IP geolocation API: vendor SDKs, raw HTTP calls and pre-parsed services, compared on accuracy, latency and integration effort.
· 2 min readIP Intelligence for Login Risk
Which IP signals matter at sign-in (new ASN, hosting ranges, proxy or Tor, blocklists), how to weigh them, and how to avoid locking out travelling users.
· 4 min readIs It Illegal to Look Up Someone's IP Address?
Looking up a public IP address is legal almost everywhere; what you do with the result is where the law applies. Where research ends and harassment begins.
· 4 min readWeb Scraping Without Getting Blocked: Understanding IP Trust Scores
Why sites score the IPs that hit them, which signals (datacenter ranges, blocklists, bot scores) trigger blocks, and how to keep a legitimate crawler's addresses clean.
· 4 min read
IP location and accuracy
15 guidesTraceroute vs IP Geolocation: Why They Do Not Always Agree
Traceroute shows the path packets take; geolocation estimates where an address is registered. Why the two disagree and which one answers which question.
· 7 min readMy IP Lookup Shows the Wrong Location — Here Is Why
Seven common reasons why an IP address lookup returns an unexpected city, country, or ISP — and how to interpret the result correctly.
· 3 min readMobile Carrier IP Geolocation: Why Phone Locations Often Look Wrong
Phones exit the internet through carrier gateways, often in another city. Why mobile IP geolocation looks wrong and what it can and cannot tell you.
· 6 min readHow Accurate Are IP Address Location Lookups?
Country-level results are usually right; city-level results depend on the ISP, mobile carriers and VPNs. What accuracy to expect and how to sanity-check a result.
· 4 min readHow to Track Public IP Geolocation Safely and Clearly
What public IP geolocation can and cannot show, how to read the result responsibly, and where it helps in security investigations and troubleshooting.
· 4 min readImpossible Travel Detection With IP Location: A Practical Guide
Use IP geolocation carefully to detect suspicious account logins that appear too far apart in too little time.
· 7 min readPractical Guide to IP Lookup for Security and Geolocation
What an IP lookup returns, how to read location, ISP, ASN and risk fields together, and how teams use lookups for fraud prevention and compliance.
· 6 min readWhat Is IP Geolocation Service and How to Use It Effectively
What an IP geolocation service returns, where the data comes from, how accurate each field is, and how to use it for localisation, fraud checks and troubleshooting.
· 5 min readIP Geolocation for Illegal IPTV: Detection & Prevention Guide
How rights holders and platforms use IP geolocation, ASN ownership and hosting signals to trace illegal IPTV streams, and the accuracy limits of that evidence.
· 5 min readBest Free IP Lookup Tools: Which One Should You Use?
Compare top free IP lookup services for geolocation, VPN detection, blacklist checks, and security insights. Find the right tool for your needs.
· 4 min readCan Someone Find My Location From My IP Address?
A public IP address usually resolves to a city or region, not a home. How close geolocation gets, who can see your IP, and what actually hides it.
· 4 min readCan You Find Someone's Address From Their IP?
An IP address points to a network and a rough area, not a street. What a lookup actually reveals, why the city can be wrong, and where the legal limits are.
· 4 min readHow Does an IP Lookup Service Actually Work?
Where lookup data comes from: registry allocations, ISP announcements, geolocation databases and reputation feeds, and why different services disagree.
· 4 min readIP Location Lookup: How Country, City, and ISP Detection Works
A practical guide to IP geolocation databases, accuracy limits, and how to interpret country, city, latitude, longitude, and ISP fields.
· 2 min readStarlink IP Addresses and Geolocation: What to Expect
Why Starlink connections geolocate to a distant city: CGNAT, ground-station routing and shared address pools, plus what to check before trusting a lookup.
· 7 min read
Fraud and risk scores
13 guidesHow to Find the Abuse Contact for an IP Address
A practical guide to finding the right abuse contact when an IP is involved in spam, scanning, fraud, or attacks.
· 6 min readReverse DNS Lookup and IP Reputation: What rDNS Can Tell You
Use reverse DNS as one clue in IP reputation analysis for mail servers, crawlers, hosting networks, and suspicious traffic.
· 7 min readReduce Fake Signups With IP Risk Signals
Use IP reputation, velocity, proxy detection, and location context to reduce fake accounts without hurting good users.
· 7 min readCredential Stuffing IP Intelligence: Detect Attacks with IP Lookup
Credential stuffing arrives from datacenter ranges, proxies and rotating addresses. Which IP signals separate an attack from a real user, and how to act on them.
· 5 min readHow to Check if an IP Address Is Blacklisted (Step by Step)
A practical guide to finding out whether an IP is on a blacklist, what it means, and what to do about it.
· 5 min readHow to Read Server Logs and Identify Malicious Bot IPs
Which log fields expose automated traffic, how to group requests by IP and ASN, and when to confirm a suspect address with a reputation lookup before blocking it.
· 5 min readIP Fraud Score: What the Numbers Actually Mean
A plain-language guide to reading IP fraud scores — what the 0–100 scale means, what triggers a high score, and how to use it without over-blocking.
· 3 min readIP Risk Score for Ecommerce
How an IP risk score fits a checkout review: pairing the score with address mismatch, proxy and hosting signals so fake orders are caught without blocking real buyers.
· 6 min readUnderstanding AI-Powered IP Health Analysis
What the AI-generated intelligence summary does with location, risk and reputation data, how to read it as a synthesis rather than a verdict, and when to ignore it.
· 2 min readWhat Does It Mean When Your IP Is Blacklisted?
What an IP blocklist listing means for your email and web traffic, why addresses get listed, how to check your reputation, and how delisting works.
· 9 min readIP Risk Score Explained: How Fraud Teams Use It to Stop Bad Actors
What goes into an IP risk score, how fraud teams combine it with geolocation, proxy and blocklist signals, and why the score is evidence rather than a verdict.
· 6 min read7 Signs Your IP Address Has Been Flagged as Suspicious
Recognise the signs that your IP has been flagged by fraud systems, email filters, or security tools — and what to do about it.
· 2 min readWhy You Got an IP Banned Error and How to Fix It
The usual reasons an address gets banned: shared NAT, abuse from a neighbour, a listed range. How to confirm your reputation and what actually gets you unblocked.
· 4 min read
VPN, proxy and Tor detection
8 guidesTor Exit Node IP Risk: How Websites Should Interpret It
Tor exit nodes show up in risk checks because many users share them. What the flag really means, and how to handle Tor traffic without punishing privacy users.
· 6 min readData Center IP vs Residential IP: How to Tell the Difference
Compare data center and residential IP addresses, including risk signals, common use cases, and safe enforcement strategies.
· 6 min readHow Do I Check My Own IP Address?
Three ways to see the public address websites receive, why it differs from your router's private address, and what an IPv6 result means.
· 5 min readHow to Check If Your VPN Is Working With an IP Lookup
Use public IP lookup, location checks, and DNS tests to verify whether your VPN is actually changing your visible network identity.
· 8 min readHow to Tell if an IP Address Is a VPN or Real User (Checklist)
A checklist of signals that help identify whether traffic is coming from a VPN, proxy, or genuine consumer ISP connection.
· 2 min readThe Difference Between a VPN, a Proxy, and a Tor Node
VPNs, proxies and Tor all put another address in front of yours, but they differ in encryption, in who can see your traffic, and in how they appear in an IP lookup.
· 5 min readCan I Change or Hide My IP Address? Practical Guide for Security-Savvy Users
Restarting a router, switching networks, a VPN and Tor each change the address a site sees in different ways. What works, what stays visible, and how to verify it.
· 4 min readHow to Hide Your IP Address: 5 Methods Explained
Compare VPNs, proxies, Tor, mobile data switching, and public Wi-Fi as methods for changing or masking your visible IP address.
· 2 min read
ISP, ASN and network ownership
5 guidesASN Lookup Explained: How to Find the Network Behind an IP
An Autonomous System Number identifies the network that announces an IP range. What an ASN lookup tells you about ownership, and why it explains traffic quality.
· 7 min readIP WHOIS and RDAP Lookup: What They Show and When to Use Them
Geolocation estimates where an IP is used; WHOIS and RDAP record who holds it and whom to contact about abuse. When to use each during an investigation.
· 8 min readWhy a Website Shows Cloudflare IP Addresses Instead of the Origin Server
A site behind Cloudflare or another CDN resolves to the CDN's addresses, not its own server. What that hides, what it does not, and how to read the lookup.
· 5 min readHow to Find the ISP or Organization Behind an IP Address
How to find the ISP or organisation behind an IP address, where that data comes from, and why it matters when you triage traffic or a security alert.
· 2 min readWhy Does Your IP Address Keep Changing?
Most home connections use dynamic addresses that ISPs reassign. Why your public IP changes, how static addresses differ, and how to check what you have right now.
· 2 min read
Privacy and IP basics
5 guidesPrivacy-Safe IP Logging: What Product Teams Should Consider
Build safer IP logging practices with retention limits, access controls, minimization, and security-focused use cases.
· 7 min readCGNAT and Shared IP Addresses: Why One IP Can Represent Many Users
Carrier-grade NAT lets hundreds of customers share one public IP. How it works, why it breaks per-IP bans, and how to account for it in fraud checks.
· 7 min readIPv4 vs IPv6: What the Shift Means for Your Privacy
IPv6 gives every device a globally reachable address and rotates temporary ones. What that changes for tracking, geolocation and VPN checks compared with shared IPv4.
· 8 min readPublic vs Private IP Address: The Simple Difference
Public addresses are routable on the internet; private ranges such as 192.168.x.x and 10.x.x.x never leave your network. Why a lookup only ever sees the public one.
· 6 min readPrivate, Reserved, and Special IP Addresses: What They Mean
Addresses such as 10.0.0.1, 192.168.1.1 and 127.0.0.1 are private, loopback or reserved. What each range is for and why a public lookup returns nothing for them.
· 2 min read
For developers
6 guidesWebhook IP Allowlisting: Security Benefits and Common Mistakes
Use IP allowlists safely for webhooks while avoiding brittle rules, stale provider ranges, and false confidence.
· 7 min readAPI Rate Limiting by IP: Benefits, Limits, and Safer Rules
Design better API limits by combining IP, token, account, and organization-level controls.
· 9 min readFree vs Paid IP Lookup Tools: What the Difference Actually Is
An honest comparison of free and paid IP lookup tools — covering data freshness, API access, rate limits, and when free is genuinely enough.
· 3 min readHow to Choose an IP Location API: Pricing, Performance, and What Really Matters
How to compare IP location APIs beyond the price tag: accuracy, uptime, rate limits, hidden costs and integration effort, with a checklist for choosing one.
· 3 min readHow to Get the User IP Address in Next.js App Router
A developer guide to reading the real client IP in Next.js 14 App Router using headers(), middleware, and edge runtime considerations.
· 2 min readRate Limiting by IP in Node.js: What You Need to Know First
A practical guide to IP-based rate limiting in Node.js — covering express-rate-limit, proxy trust, shared IPs, and when IP limits are not enough.
· 2 min read
Security and incident response
3 guidesBlocking IP Addresses in a Firewall: Best Practices
How to block abusive IP addresses in a firewall without sweeping up shared networks, and how to keep the block list from turning into a maintenance burden.
· 7 min readIncident Response IP Triage: A Fast Checklist
A practical checklist for investigating suspicious IP addresses during security incidents.
· 9 min readWhat Is an IP Address and Why Should I Care?
An IP address is how the internet routes traffic to your connection. Public vs private addresses, IPv4 vs IPv6, and why the address matters for security.
· 6 min read
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