- rfc3748: Extensible Authentication Protocol (EAP)
- rfc3022: Traditional IP Network Address Translator (Traditional NAT)
- rfc3031: Multiprotocol Label Switching Architecture
- rfc3032: MPLS Label Stack Encoding
- rfc3036: LDP Specification
- rfc3057: ISDN Q.921-User Adaptation Layer
- rfc3080: The Blocks Extensible Exchange Protocol Core
- rfc3094: Tekelec's Transport Adapter Layer Interface
- rfc3164:The BSD syslog Protocol
- rfc3168: The Addition of Explicit Congestion Notification (ECN) to IP
- rfc3208: PGM Reliable Transport Protocol Specification
- rfc3209: RSVP-TE: Extensions to RSVP for LSP Tunnels
- rfc3212: Constraint-Based LSP Setup using LDP
- rfc3213: Applicability Statement for CR-LDP
- rfc3219: Telephony Routing over IP (TRIP)
- rfc3241: Robust Header Compression (ROHC) over PPP
- rfc3257:Stream Control Transmission Protocol Applicability Statement
- rfc3261: SIP: Session Initiation Protocol
- rfc3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP)
- rfc3263: Session Initiation Protocol (SIP): Locating SIP Servers
- rfc3264: An Offer/Answer Model with the Session Description Protocol (SDP)
- rfc3265: Session Initiation Protocol (SIP)-Specific Event Notification
- rfc3275: (Extensible Markup Language) XML-Signature Syntax and Processing
- rfc3331: Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Adaptation Layer
- rfc3332: Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)
- rfc3344: IP Mobility Support for IPv4
- rfc3347: Small Computer Systems Interface protocol over the Internet (iSCSI) Requirements and Design Considerations
- rfc3372: Session Initiation Protocol for Telephones (SIP-T): Context and Architectures
- rfc3376: Internet Group Management Protocol, Version 3
- rfc3377: Lightweight Directory Access Protocol (v3): Technical Specification
- rfc3396: Encoding Long Options in the Dynamic Host Configuration Protocol (DHCPv4)
- rfc3410: Introduction and Applicability Statements for Internet Standard Management Framework
- rfc3411: An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks
- rfc3412: Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)
- rfc3413: Simple Network Management Protocol (SNMP) Applications
- rfc3414: User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)
- rfc3415: View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)
- rfc3416: Version 2 of the Protocol Operations for the Simple Network Management Protocol (SNMP)
- rfc3417: Transport Mappings for the Simple Network Management Protocol (SNMP)
- rfc3418: Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)
- rfc3428: Session Initiation Protocol (SIP) Extension for Instant Messaging
- rfc3435: Media Gateway Control Protocol (MGCP) Version 1.0
- rfc3443: Time To Live (TTL) Processing in Multi-Protocol Label Switching (MPLS) Networks
- rfc3488: Cisco Systems Router-port Group Management Protocol (RGMP)
- rfc3501: INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1
- rfc3518: Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP)
- rfc3525: Gateway Control Protocol Version 1
- rfc3530: Network File System (NFS) version 4 Protocol
- rfc3544: IP Header Compression over PPP
- rfc3545: Enhanced Compressed RTP (CRTP) for Links with High Delay, Packet Loss and Reordering
- rfc3550: RTP: A Transport Protocol for Real-Time Applications
- rfc3551: RTP Profile for Audio and Video Conferences with Minimal Control
- rfc3569: An Overview of Source-Specific Multicast (SSM)
- rfc3584: Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework
- rfc3618: Multicast Source Discovery Protocol (MSDP)
- rfc3643: Fibre Channel (FC) Frame Encapsulation
- rfc3661: Media Gateway Control Protocol (MGCP) Return Code Usage
- rfc3720: Internet Small Computer Systems Interface (iSCSI)
- rfc3761: The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)
- rfc3768: Virtual Router Redundancy Protocol (VRRP)
- rfc3775: Mobility Support in IPv6
- rfc3788: Security Considerations for Signaling Transport (SIGTRAN) Protocols
- rfc3807: V5.2-User Adaptation Layer (V5UA)
- rfc3821: Fibre Channel Over TCP/IP (FCIP)
- rfc3853: S/MIME Advanced Encryption Standard (AES) Requirement for the Session Initiation Protocol (SIP)
- rfc3860: Common Profile for Instant Messaging (CPIM)
- rfc3868:Signalling Connection Control Part User Adaptation Layer (SUA)
- rfc3873: Stream Control Transmission Protocol (SCTP) Management Information Base (MIB)
- rfc3912: WHOIS Protocol Specification
- rfc3913: Border Gateway Multicast Protocol (BGMP): Protocol Specification
- rfc3917: Requirements for IP Flow Information Export (IPFIX)
- rfc3920: Extensible Messaging and Presence Protocol (XMPP): Core
- rfc3921: Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence
- rfc3922: Mapping the Extensible Messaging and Presence Protocol (XMPP) to Common Presence and Instant Messaging (CPIM)
- rfc3923: End-to-End Signing and Object Encryption for the Extensible Messaging and Presence Protocol (XMPP)
- rfc3936: Procedures for Modifying the Resource reSerVation Protocol (RSVP)
- rfc3945: Generalized Multi-Protocol Label Switching (GMPLS) Architecture
- rfc3951: Internet Low Bit Rate Codec (iLBC)
- rfc3973: Protocol Independent Multicast - Dense Mode (PIM-DM): Protocol Specification (Revised)
- rfc3977: Network News Transfer Protocol (NNTP)
- rfc3984: RTP Payload Format for H.264 Video
- rfc3986: Uniform Resource Identifier (URI): Generic Syntax