Networking
Understand IP addresses and DNS records, prepare domain changes, and investigate connection problems. 11 articles.
How Accurate Is IP Geolocation?
IP geolocation is often fine at city or region level and almost never street-accurate. How GeoIP databases work, why VPN and CGNAT skew results, and what FindMyIP actually shows.
What Is an ASN? The Network Number Behind Your ISP
ASN (Autonomous System Number) is the routing ID behind your ISP name. What AS3303 or AS7922 means, why tools show it, and when normal users should care.
Does Your IP Address Stay the Same?
Why your public IP often changes over time: DHCP leases, ISP reassignment, static vs dynamic home internet, mobile/CGNAT exits, and what a VPN does to the address sites see.
How to Find Out Your ISP From Your IP Address
Look up which ISP or network owns your public IP. How the lookup works, why the name may not match your bill, and when VPN, mobile, or CGNAT change the result.
Site Down or DNS/IP Issue? How to Tell
Use a second network, browser checks and DNS results to narrow down a website failure without assuming one test proves the cause.
DNS TTL Before a Domain Move: A Simple Plan
Lower DNS TTL before you move a domain or host — timeline, which records to touch, how long to wait, and how to verify the cutover without guessing.
What Is CGNAT? Shared Public IP Explained
What is CGNAT? Why ISPs share one public IPv4 across many homes, how to spot it on your router, and what breaks for gaming and port forwards.
What Is DNS Propagation? (And How Long)
What is DNS propagation? Why DNS changes take time, what TTL controls, and how to check whether resolvers see your new A or MX records today.
IPv4 vs IPv6: What Normal Users Need
IPv4 vs IPv6 for normal users: what the family shown on FindMyIP means, what dual-stack means at home, and when a broken IPv6 path makes only some sites fail.
How to Read DNS Lookup Results
How to read a DNS lookup: what A, AAAA, MX, NS, and TXT records mean — plus how to spot missing mail, wrong IPs, and nameserver mismatches fast.
Public vs Private IP Address Explained
Public vs private IP explained: RFC1918 home ranges, when each address appears, and how to check which one the open internet actually sees today.