ipWhat are ISP and ASN? Reading a lookup result
Learn what provider, organization, and ASN fields mean in an IP lookup and why they may show different names.
Read guideNetworking
Explore practical articles about networking, with examples and explanations for understanding your internet connection.
8 guides · Clear explanations. Practical examples.What is DNS and how does it relate to IP addresses?
Learn how domain names resolve to IP addresses and why changing DNS does not change your public IP.
Read guideA, AAAA, and CNAME records explained
Compare DNS address and alias records, IPv6 support, and the connection problems incorrect records can cause.
Read guideWhat is NAT? How devices share an IP
Understand NAT connection mappings, shared public IPv4 addresses, and why incoming connections behave differently.
Read guideWhat is CGNAT and how can you recognize it?
Learn how CGNAT affects shared IPs and remote access, and how to compare a router WAN address with a public IP.
Read guideHow to read CIDR and subnet masks
Understand CIDR prefixes such as /24 and /32, address counts, and the difference between a prefix and one IP.
Read guideWhat is DHCP? Automatic address assignment
Learn DHCP leases, address pools, and reservations, including their relationship to local address conflicts.
Read guideIP addresses and port numbers: the difference
Learn how IP addresses identify destinations and ports identify services, including what a port number cannot prove.
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