Loading network utility...
Loading network utility...
Crisp, vector-quality 1-page PDF reference sheets formatted for standard Letter and A4 printing. Free for personal, academic, and enterprise engineering teams.
Complete 1-page reference chart covering all 25 prefixes from /8 down to /32. Includes dotted decimal subnet masks, wildcard masks, total IP count, usable hosts, and RFC class classifications.
Essential guide to IPv6 address architecture (RFC 4291). Covers Global Unicast, Unique Local (ULA), Link-Local, Multicast, prefix allocations (/32, /48, /56, /64), and SLAAC capacities.
Visual guide to Unix and Linux file security. Covers binary bit calculation (4-2-1), standard octal modes (755, 644, 600, 700), symbolic strings, and special execution bits (SUID, SGID, Sticky).
Essential reference list of the top 25 standardized network ports. Includes transport protocols (TCP/UDP), standard service names (SSH, DNS, HTTPS, MySQL, Redis), and cybersecurity considerations.
Clean 1-page reference for RFC 9110 HTTP status codes across 2xx, 3xx, 4xx, and 5xx classes, plus essential security & caching headers (HSTS, CSP, X-Frame-Options, Cache-Control).
Complete zone file and DNS resolution guide. Covers A, AAAA, CNAME, MX, TXT (SPF/DKIM/DMARC), NS, SOA, PTR, SRV, CAA, plus terminal diagnostic commands for dig and nslookup.
Essential terminal recipes for testing TLS handshakes (s_client), checking certificate expiry, modulus matching, CSR creation, and certificate format conversions (.pem, .crt, .key, .pfx).
Terminal quick reference for cURL HTTP methods (-X), custom headers (-H), JSON data payloads (--json), Basic/Bearer authentication (-u), TLS verification (-k), and latency benchmarking.
Strict RFC 8259 JSON syntax rules and common validation gotchas, paired with practical jq terminal commands for filtering, mapping, array manipulation, and unquoted output extraction.
Complete guide to domain registry status codes (clientTransferProhibited, serverHold, redemptionPeriod), renewal grace periods, and the 75-day expiration-to-drop deletion timeline.
All PDF documents on LotsofNetwork are rendered using native vector typography, ensuring crisp lines and readable text on any laser or inkjet printer at 300+ DPI. Free to distribute, laminate, print for classroom use, or share across engineering Slack/Teams channels.