pjhtech ToolsIPv4 Subnet Mask Table
One A4 page: every IPv4 prefix, mask, wildcard, address count, subnet boundaries and special-range reminders.
A4 referenceOne-Page Network Cheat Sheets
A4 desk and field references for subnetting, IPv6, ports, DNS, packet sizes, Wi-Fi and cellular bands.
Each reference has a dedicated one-page A4 layout. Use Print / Save PDF at 100% scale with browser headers and footers disabled. Sources and longer explanations remain on the web page.
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References
Subnetting Worked Examples
Work through original subnetting examples for boundaries, host capacity and address allocation.
A4 referenceSpecial and Private IP Address Reference
Recognize common private, shared, loopback, documentation and local address ranges.
A4 referenceCommon TCP / UDP Ports Reference
Common service ports and transport choices in a printable reference.
A4 referenceDNS Record Cheat Sheet
Understand common DNS record types, TTLs and frequent configuration mistakes.
A4 referenceIPv6 Quick Reference
A one-page A4 reference for IPv6 notation, prefix sizes, address types, multicast and reverse DNS.
A4 referenceEthernet, MTU & TCP MSS Quick Reference
A one-page A4 reference for frame size, VLAN overhead, IP MTU, TCP MSS and tunnel budgeting.
A4 referenceWi-Fi PHY Rate & Channel Width Cheat Sheet
One A4 page explaining Wi-Fi generations, channel widths, spatial streams and PHY rates without promising Internet speeds.
A4 referenceMikroTik
MikroTik RouterOS WiFi Band Quick Reference
One A4 page of current /interface/wifi band selectors, package distinctions and channel-width syntax.
A4 referenceMikroTik LTE & 5G Band Quick Reference
One A4 field reference for selected European-relevant LTE and NR bands, duplex modes, frequency ranges and RouterOS selectors.
A4 reference