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Cheat Sheets · Free Reference

Cheat / Sheets.

Fast, searchable, copyable references for developers and security analysts.
Everything in one place, pick a topic below.

Seven references, 497 entries, all on one page each. No pagination, no accordion hiding the row you came for: open the sheet, use your browser's find, copy the value, close the tab.

Reading a packet capture or a scan
Network ports and CIDR cover what you will hit first.
Debugging an HTTP call
Status codes and MIME types, both with what actually causes them.
Writing a pattern against logs
The regex sheet, then the tester to check it on real input.
Decoding something by hand
ASCII and HTML entities, in decimal, hex, octal and binary.
Regex
Syntax, quantifiers, character classes, groups, lookaheads and common patterns.
59 patterns & tokens
HTTP Status Codes
Every 1xx–5xx code with meaning, when it fires and how to handle it.
33 status codes
Network Ports
Well-known and registered TCP/UDP ports with their services.
85 ports
ASCII Table
Decimal, hex, octal and binary for every ASCII character.
128 characters
CIDR / Subnets
Prefix lengths, host counts, netmasks and subnet ranges at a glance.
43 prefix lengths
MIME Types
Content types mapped to file extensions for the web and email.
53 content types
HTML Entities
Named and numeric entities for symbols, arrows, math and punctuation.
96 entities
Looking to go deeper? Browse Learn & comparisons

While you are here

Ransomware Response: The Decisions That Matter in the First 24 Hours Ransomware response is a sequence of decisions, not a timeline. Isolate or observe, verify backups before promising recovery, scope exfiltration, and start the legal clocks on time. incident response · 8 min read The First 60 Minutes: An Incident Response Checklist That Works Under Stress When an alert turns real, the first hour decides the investigation. A concrete checklist for validating, scoping, preserving evidence, and avoiding the mistakes that cannot be undone. incident response · 7 min read The Attack Surface You Forgot: Scanning Your Own Infrastructure Attackers scan your perimeter every day. Most organizations scan their own once a year. Here is what external recon on yourself reveals, and why continuous beats annual. soc · 7 min read
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