~/netref / Overview
$ whoami

netref — the whole
network stack,
one tab away.

IPv4 subnetting, CIDR, masks, IPv6, ports, routing, NAT, DNS — every reference table worth memorizing, plus a live subnet calculator. Pick a section, or hit search.

Fundamentals
osi OSI & TCP/IP flow OSI Encapsulation bin Binary / Dec / Hex
Addressing
addr IP Classes & Reserved v6 IPv6 v6+ IPv6 Advanced
Subnetting
cidr IPv4 Subnetting / CIDR mask Subnet Mask Table vlsm VLSM & Supernetting bulk Bulk Subnet Table free Next Free Subnet
Switching · L2
l2 Ethernet, MAC & ARP vlan VLANs & Trunking stp STP & EtherChannel
Routing · Transport
route Routing & AD l4 TCP / UDP & Transport tcp TCP Flow Animation nat NAT / PAT fhrp First-Hop Redundancy
Routing Protocols
igp Protocols Compared ospf OSPF eigrp EIGRP bgp BGP isis IS-IS
Services
port Ports & Protocols dns DNS & DHCP tls TLS / SSL http HTTP / HTTPS mail Email Protocols qos QoS
Infrastructure
dev Devices & Appliances phy Cabling & Physical (L1) topo Topologies & Architecture
Wireless
wifi Wi-Fi & 802.11 rf Wireless RF & Design
WAN · Cloud
wan WAN & SD-WAN ppp PPP & Serial cloud Cloud & Virtualization
Security
risk Threats & Attacks acl ACLs & Firewalls vpn VPN & IPsec aaa AAA & Access Control crypto Cryptography Basics hard Device Hardening
Operations
diag Diagnostic Tools & ICMP cli Command Cheatsheet mon Monitoring & Management doc Documentation & IPAM perf Performance Metrics auto Automation & APIs
Capture · Analysis
tcpd tcpdump wsf Wireshark Filters scpy Scapy nmap Nmap dig dig / nslookup
Advanced
mcast Multicast (IGMP/PIM) voip VoIP & Collaboration san Storage Networking dc Data Center ot IoT / ICS / SCADA
Tools
calc Subnet Calculator map Subnet Visualizer conv Mask ↔ CIDR acl+ Wildcard / ACL Builder plan VLSM Subnet Planner agg Supernet Aggregator lap CIDR Overlap Checker mtu MTU / MSS Calculator diff Subnet Compare v46 IPv4 ↔ IPv6 ptr Reverse DNS / PTR aggr BGP Aggregator v6c IPv6 Compress / Expand insp IP Inspector mac MAC Tools bw Bandwidth / Transfer sla SLA / Uptime print Print Cheatsheet
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