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• IP アドレス·2026/09/15·2分で読めます

  Public vs private IP addresses

  Why your laptop's address starts with 192.168 while websites see something else — and what that means for connectivity and privacy.

• IP アドレス·2026/09/12·2分で読めます

  CIDR and subnets, explained with examples

  What /24 means, how to calculate network and broadcast addresses, and how to split a network into subnets — without memorising tables.

• プライバシーとセキュリティ·2026/09/08·3分で読めます

  How IP geolocation works — and why it's often wrong

  Location databases don't know where you are. They know where an address block is probably used. The difference matters.

• ルーティング·2026/09/01·2分で読めます

  What is an ASN (autonomous system number)?

  The internet is about 80,000 independent networks agreeing to carry each other's traffic. Each one has a number. Here's what it means.

• IP アドレス·2026/08/25·2分で読めます

  IPv4 vs IPv6: what actually changes

  Address size is the headline, but the real differences are in how networks are numbered, how devices configure themselves, and what happens to NAT.

• IP アドレス·2026/08/18·2分で読めます

  What is an IP address?

  The number that identifies your connection on the internet — what it is, who assigns it, and what it does and doesn't reveal about you.