What does the CheckIP team write about?
The CheckIP team writes guides that answer the questions people have right after using one of our tools. A visitor sees an unfamiliar ASN, a city that looks wrong or a port marked "filtered", and the guide explains what that result means and what to do next. Most articles fall into four groups:
- IP address basics: public and private IPs, IPv4 and IPv6, static and dynamic IPs, and how to find the IP address of a phone, laptop or router.
- Router and Wi-Fi: logging in to a router, changing the Wi-Fi password, default gateways and SSIDs.
- Ports and DNS: open ports, port forwarding, public DNS resolvers such as 8.8.8.8 and 1.1.1.1, and where a website is hosted.
- Network privacy: what an IP address reveals, how VPNs and proxies change it, and how to check that they work.
Two good places to start are our guide to what an IP address is and the step-by-step guide on how to find your IP address on any device.
Which tools does the CheckIP team build?
The team builds and maintains all eight tools on checkip.day. The main one is the homepage IP checker, which shows your public IP, ISP and approximate location. When an article quotes a tool result, it is the real output of that tool, not a mock-up.
The IP lookup tool returns the owner, ASN, hostname and whois record for any IP or domain. The website location checker compares six GeoIP databases on one page: IPinfo, MaxMind, IP2Location, IPGeolocation.io, DB-IP and Cloudflare. Working with six sources every day is why our guides say plainly that IP location is reliable at country level and often off at city level.
How the CheckIP team tests each guide
Every step in a how-to guide is followed on a real device before the guide goes live. Windows steps are checked on Windows 11 and Windows 10. Phone steps are checked on both iPhone and Android, because menu names differ between the two. If a step cannot be reproduced, it is not published.
Technical facts are checked against the primary source and linked: RFC standards for protocols, the regional internet registries (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC) for IP ownership, and vendor documentation for router and operating system menus. Each article shows the date it was published and the date of its last update.
How to report a mistake in a CheckIP guide
Email [email protected] with the article link, what you see on your screen and, if you can, a screenshot. Router firmware, ISP settings and operating system menus change often, so reports from readers are the fastest way we learn a step is out of date. We check every report. When it is confirmed, we fix the guide and change its "last updated" date.
Contact the CheckIP team
Email: [email protected]. Address: 80 Ha Dac Street, Trung My Tay Ward, Ho Chi Minh City, Vietnam. Company details, data sources and how we handle visitor data are on the about CheckIP page.
