Toolzer Guides
Long-form, citable reference articles on networking, web protocols, DNS, and security. Every guide is maintained, sourced, and freely reusable — link to any of them from your documentation, blog post, or Stack Overflow answer.
IPv4 vs IPv6: Complete Comparison
Address space, header format, security, NAT, adoption rates — every meaningful difference between the two IP protocols in one table.
Read the guideWebHTTP Status Codes: The Complete Reference
Every HTTP status code (1xx → 5xx) with what it means, when servers send it, and how clients should react. Includes real-world examples.
Read the guideDNSDNS Record Types Explained
A, AAAA, CNAME, MX, TXT, NS, SOA, PTR, SRV, and CAA records — what each one does, when to use it, and how it appears in a zone file.
Read the guideSecurityPassword Security: Modern Best Practices
NIST 2024 guidance, password entropy math, cracking-time tables, 2FA, passkeys, and password managers — what actually keeps accounts safe today.
Read the guideAbout these guides
Toolzer publishes these reference articles to complement our free browser tools. Each one is written by practitioners, reviewed for technical accuracy, and updated when the underlying standards change (RFCs, NIST publications, IANA registries). You're welcome to quote, screenshot, or link to any section — a backlink to the original page is the only thing we ask in return.