DNS Resources
- OneWhois.com - The Shared Registry System Whois
- DNSRD - The DNS Resources Directory
- Internet Software Consortium - Maintainers of BIND
- DNS Tools by Paul Balyoz
- Domain Whois and IP Whois
- Acme Byte & Wire's Ask Mr. DNS
- The Domain Name Handbook
- DNS Policy News
- Domain name registries around the world
- DNResources
- Domains Weekly - e-zine of unregistered and recently deleted domain names
- Top 100 Domain Name Sites
Misc. Resources
- 3Com's Understanding IP Addressing [PDF]
- TCP/IP Port Numbers (including Well Known Port Numbers and Registered Port Numbers)
RFCs - Request For Comments
- DNSRD's Index of DNS-related RFCs
- RFC974 - Mail Routing and the Domain System
- RFC1034 - Domain Names - Concepts and Facilities
- RFC1035 - Domain Names - Implementation and Specification
- RFC1591 - Domain Name System Structure and Delegation
- RFC1700 - Assigned Numbers
- RFC1918 - Address Allocation for Private Internets
- RFC2821 - Simple Mail Transfer Protocol
- RFC2142 - Mailbox Names for Common Services, Roles and Functions
- Index of all active RFCs
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