| RFC | Description | Author(s) | Status | Obsoleted by | Updated by | 
   
    | 6501 | Conference Information Data Model for Centralized Conferencing (XCON) | O. Novo, G. Camarillo, D. Morgan, J. Urpalainen | Proposed standard |  |  | 
   
    | 6502 | Conference Event Package Data Format Extension for Centralized Conferencing (XCON) | G. Camarillo, S. Srinivasan, R. Even, J. Urpalainen | Proposed standard |  |  | 
   
    | 6503 | Centralized Conferencing Manipulation Protocol | M. Barnes, C. Boulton, S. Romano, H. Schulzrinne | Proposed standard |  |  | 
   
    | 6504 | Centralized Conferencing Manipulation Protocol (CCMP) Call Flow Examples | M. Barnes, L. Miniero, R. Presta, S P. Romano | Informational |  |  | 
   
    | 6505 | A Mixer Control Package for the Media Control Channel Framework | S. McGlashan, T. Melanchuk, C. Boulton | Proposed standard |  |  | 
   
    | 6506 | Supporting Authentication Trailer for OSPFv3 | M. Bhatia, V. Manral, A. Lindem | Proposed standard | RFC 7166 |  | 
   
    | 6507 | Elliptic Curve-Based Certificateless Signatures for Identity-Based Encryption (ECCSI) | M. Groves | Informational |  |  | 
   
    | 6508 | Sakai-Kasahara Key Encryption (SAKKE) | M. Groves | Informational |  |  | 
   
    | 6509 | MIKEY-SAKKE: Sakai-Kasahara Key Encryption in Multimedia Internet KEYing (MIKEY) | M. Groves | Informational |  |  | 
   
    | 6510 | Resource Reservation Protocol (RSVP) Message Formats for Label Switched Path (LSP) Attributes Objects | L. Berger, G. Swallow | Proposed standard |  |  | 
   
    | 6511 | Non-Penultimate Hop Popping Behavior and Out-of-Band Mapping for RSVP-TE Label Switched Paths | Z. Ali, G. Swallow, R. Aggarwal | Proposed standard |  |  | 
   
    | 6512 | Using Multipoint LDP When the Backbone Has No Route to the Root | IJ. Wijnands, E. Rosen, M. Napierala, N. Leymann | Proposed standard |  |  | 
   
    | 6513 | Multicast in MPLS/BGP IP VPNs | E. Rosen, Ed., R. Aggarwal, Ed. | Proposed standard |  | RFC 7582, RFC 7900, RFC 7988 | 
   
    | 6514 | BGP Encodings and Procedures for Multicast in MPLS/BGP IP VPNs | R. Aggarwal, E. Rosen, T. Morin, Y. Rekhter | Proposed standard |  | RFC 6515, RFC 6625, RFC 7385, RFC 7441, RFC 7582, RFC 7899, RFC 7900, RFC 7902, RFC 7988, RFC 8534, RFC 9081, RFC 9573 | 
   
    | 6515 | IPv4 and IPv6 Infrastructure Addresses in BGP Updates for Multicast VPN | R. Aggarwal, E. Rosen | Proposed standard |  |  | 
   
    | 6516 | IPv6 Multicast VPN (MVPN) Support Using PIM Control Plane and Selective Provider Multicast Service Interface (S-PMSI) Join Messages | Y. Cai, E. Rosen, Ed., I. Wijnands | Proposed standard |  |  | 
   
    | 6517 | Mandatory Features in a Layer 3 Multicast BGP/MPLS VPN Solution | T. Morin, Ed., B. Niven-Jenkins, Ed., Y. Kamite, R. Zhang, N. Leymann, N. Bitar | Informational |  |  | 
   
    | 6518 | Keying and Authentication for Routing Protocols (KARP) Design Guidelines | G. Lebovitz, M. Bhatia | Informational |  |  | 
   
    | 6519 | RADIUS Extensions for Dual-Stack Lite | R. Maglione, A. Durand | Proposed standard |  |  | 
   
    | 6520 | Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) Heartbeat Extension | R. Seggelmann, M. Tuexen, M. Williams | Proposed standard |  | RFC 8447 | 
   
    | 6521 | Home Agent-Assisted Route Optimization between Mobile IPv4 Networks | A. Makela, J. Korhonen | Experimental |  |  | 
   
    | 6522 | The Multipart/Report Media Type for the Reporting of Mail System Administrative Messages | M. Kucherawy, Ed. | Internet standard |  | RFC 6533 | 
   
    | 6525 | Stream Control Transmission Protocol (SCTP) Stream Reconfiguration | R. Stewart, M. Tuexen, P. Lei | Proposed standard |  |  | 
   
    | 6526 | IP Flow Information Export (IPFIX) Per Stream Control Transmission Protocol (SCTP) Stream | B. Claise, P. Aitken, A. Johnson, G. Muenz | Proposed standard |  |  | 
   
    | 6527 | Definitions of Managed Objects for Virtual Router Redundancy Protocol Version 3 (VRRPv3) | K. Tata | Proposed standard |  |  | 
   
    | 6528 | Defending against Sequence Number Attacks | F. Gont, S. Bellovin | Proposed standard | RFC 9293 |  | 
   
    | 6529 | Host/Host Protocol for the ARPA Network | A. McKenzie, S. Crocker | Historic |  |  | 
   
    | 6530 | Overview and Framework for Internationalized Email | J. Klensin, Y. Ko | Proposed standard |  |  | 
   
    | 6531 | SMTP Extension for Internationalized Email | J. Yao, W. Mao | Proposed standard |  |  | 
   
    | 6532 | Internationalized Email Headers | A. Yang, S. Steele, N. Freed | Proposed standard |  |  | 
   
    | 6533 | Internationalized Delivery Status and Disposition Notifications | T. Hansen, Ed., C. Newman, A. Melnikov | Proposed standard |  |  | 
   
    | 6534 | Loss Episode Metrics for IP Performance Metrics (IPPM) | N. Duffield, A. Morton, J. Sommers | Proposed standard |  |  | 
   
    | 6535 | Dual-Stack Hosts Using "Bump-in-the-Host" (BIH) | B. Huang, H. Deng, T. Savolainen | Proposed standard |  |  | 
   
    | 6536 | Network Configuration Protocol (NETCONF) Access Control Model | A. Bierman, M. Bjorklund | Proposed standard | RFC 8341 |  | 
   
    | 6537 | Host Identity Protocol Distributed Hash Table Interface | J. Ahrenholz | Experimental |  |  | 
   
    | 6538 | The Host Identity Protocol (HIP) Experiment Report | T. Henderson, A. Gurtov | Informational |  |  | 
   
    | 6539 | IBAKE: Identity-Based Authenticated Key Exchange | V. Cakulev, G. Sundaram, I. Broustis | Informational |  |  | 
   
    | 6540 | IPv6 Support Required for All IP-Capable Nodes | W. George, C. Donley, C. Liljenstolpe, L. Howard | Best current practice |  |  | 
   
    | 6541 | DomainKeys Identified Mail (DKIM) Authorized Third-Party Signatures | M. Kucherawy | Experimental |  |  | 
   
    | 6542 | Kerberos Version 5 Generic Security Service Application Program Interface (GSS-API) Channel Binding Hash Agility | S. Emery | Proposed standard |  |  | 
   
    | 6543 | Reserved IPv6 Interface Identifier for Proxy Mobile IPv6 | S. Gundavelli | Proposed standard |  |  | 
   
    | 6544 | TCP Candidates with Interactive Connectivity Establishment (ICE) | J. Rosenberg, A. Keranen, B. B. Lowekamp, A. B. Roach | Proposed standard |  |  | 
   
    | 6545 | Real-time Inter-network Defense (RID) | K. Moriarty | Proposed standard |  |  | 
   
    | 6546 | Transport of Real-time Inter-network Defense (RID) Messages over HTTP/TLS | B. Trammell | Proposed standard |  |  | 
   
    | 6547 | RFC 3627 to Historic Status | W. George | Informational |  |  | 
   
    | 6548 | Independent Submission Editor Model | N. Brownlee, Ed., IAB | Informational | RFC 8730 |  | 
   
    | 6549 | OSPFv2 Multi-Instance Extensions | A. Lindem, A. Roy, S. Mirtorabi | Proposed standard |  |  | 
   
    | 6550 | RPL: IPv6 Routing Protocol for Low-Power and Lossy Networks | T. Winter, Ed., P. Thubert, Ed., A. Brandt, J. Hui, R. Kelsey, P. Levis, K. Pister, R. Struik, JP. Vasseur, R. Alexander | Proposed standard |  | RFC 9008, RFC 9010, RFC 9685 | 
   
    | 6551 | Routing Metrics Used for Path Calculation in Low-Power and Lossy Networks | JP. Vasseur, Ed., M. Kim, Ed., K. Pister, N. Dejean, D. Barthel | Proposed standard |  |  | 
   
    | 6552 | Objective Function Zero for the Routing Protocol for Low-Power and Lossy Networks (RPL) | P. Thubert, Ed. | Proposed standard |  |  | 
   
    | 6553 | The Routing Protocol for Low-Power and Lossy Networks (RPL) Option for Carrying RPL Information in Data-Plane Datagrams | J. Hui, JP. Vasseur | Proposed standard |  | RFC 9008, RFC 9685 | 
   
    | 6554 | An IPv6 Routing Header for Source Routes with the Routing Protocol for Low-Power and Lossy Networks (RPL) | J. Hui, JP. Vasseur, D. Culler, V. Manral | Proposed standard |  |  | 
   
    | 6555 | Happy Eyeballs: Success with Dual-Stack Hosts | D. Wing, A. Yourtchenko | Proposed standard | RFC 8305 |  | 
   
    | 6556 | Testing Eyeball Happiness | F. Baker | Informational |  |  | 
   
    | 6557 | Procedures for Maintaining the Time Zone Database | E. Lear, P. Eggert | Best current practice |  |  | 
   
    | 6558 | Sieve Extension for Converting Messages before Delivery | A. Melnikov, B. Leiba, K. Li | Proposed standard |  |  | 
   
    | 6559 | A Reliable Transport Mechanism for PIM | D. Farinacci, IJ. Wijnands, S. Venaas, M. Napierala | Experimental |  |  | 
   
    | 6560 | One-Time Password (OTP) Pre-Authentication | G. Richards | Proposed standard |  |  | 
   
    | 6561 | Recommendations for the Remediation of Bots in ISP Networks | J. Livingood, N. Mody, M. O'Reirdan | Informational |  |  | 
   
    | 6562 | Guidelines for the Use of Variable Bit Rate Audio with Secure RTP | C. Perkins, JM. Valin | Proposed standard |  |  | 
   
    | 6563 | Moving A6 to Historic Status | S. Jiang, D. Conrad, B. Carpenter | Informational |  |  | 
   
    | 6564 | A Uniform Format for IPv6 Extension Headers | S. Krishnan, J. Woodyatt, E. Kline, J. Hoagland, M. Bhatia | Proposed standard |  |  | 
   
    | 6565 | OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol | P. Pillay-Esnault, P. Moyer, J. Doyle, E. Ertekin, M. Lundberg | Proposed standard |  |  | 
   
    | 6566 | A Framework for the Control of Wavelength Switched Optical Networks (WSONs) with Impairments | Y. Lee, Ed., G. Bernstein, Ed., D. Li, G. Martinelli | Informational |  |  | 
   
    | 6567 | Problem Statement and Requirements for Transporting User-to-User Call Control Information in SIP | A. Johnston, L. Liess | Informational |  |  | 
   
    | 6568 | Design and Application Spaces for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs) | E. Kim, D. Kaspar, JP. Vasseur | Informational |  |  | 
   
    | 6569 | Guidelines for Development of an Audio Codec within the IETF | JM. Valin, S. Borilin, K. Vos, C. Montgomery, R. Chen | Informational |  |  | 
   
    | 6570 | URI Template | J. Gregorio, R. Fielding, M. Hadley, M. Nottingham, D. Orchard | Proposed standard |  |  | 
   
    | 6571 | Loop-Free Alternate (LFA) Applicability in Service Provider (SP) Networks | C. Filsfils, Ed., P. Francois, Ed., M. Shand, B. Decraene, J. Uttaro, N. Leymann, M. Horneffer | Informational |  |  | 
   
    | 6572 | RADIUS Support for Proxy Mobile IPv6 | F. Xia, B. Sarikaya, J. Korhonen, Ed., S. Gundavelli, D. Damic | Proposed standard |  | RFC 8044 | 
   
    | 6573 | The Item and Collection Link Relations | M. Amundsen | Informational |  |  | 
   
    | 6574 | Report from the Smart Object Workshop | H. Tschofenig, J. Arkko | Informational |  |  | 
   
    | 6575 | Address Resolution Protocol (ARP) Mediation for IP Interworking of Layer 2 VPNs | H. Shah, Ed., E. Rosen, Ed., G. Heron, Ed., V. Kompella, Ed. | Proposed standard |  |  | 
   
    | 6576 | IP Performance Metrics (IPPM) Standard Advancement Testing | R. Geib, Ed., A. Morton, R. Fardid, A. Steinmitz | Best current practice |  |  | 
   
    | 6577 | Authentication-Results Registration Update for Sender Policy Framework (SPF) Results | M. Kucherawy | Proposed standard | RFC 7001 |  | 
   
    | 6578 | Collection Synchronization for Web Distributed Authoring and Versioning (WebDAV) | C. Daboo, A. Quillaud | Proposed standard |  |  | 
   
    | 6579 | The 'disclosure' Link Relation Type | M. Yevstifeyev | Informational |  |  | 
   
    | 6580 | IANA Registries for the Remote Direct Data Placement (RDDP) Protocols | M. Ko, D. Black | Proposed standard |  |  | 
   
    | 6581 | Enhanced Remote Direct Memory Access (RDMA) Connection Establishment | A. Kanevsky, Ed., C. Bestler, Ed., R. Sharp, S. Wise | Proposed standard |  |  | 
   
    | 6582 | The NewReno Modification to TCP's Fast Recovery Algorithm | T. Henderson, S. Floyd, A. Gurtov, Y. Nishida | Proposed standard |  |  | 
   
    | 6583 | Operational Neighbor Discovery Problems | I. Gashinsky, J. Jaeggli, W. Kumari | Informational |  |  | 
   
    | 6584 | Simple Authentication Schemes for the Asynchronous Layered Coding (ALC) and NACK-Oriented Reliable Multicast (NORM) Protocols | V. Roca | Proposed standard |  |  | 
   
    | 6585 | Additional HTTP Status Codes | M. Nottingham, R. Fielding | Proposed standard |  |  | 
   
    | 6586 | Experiences from an IPv6-Only Network | J. Arkko, A. Keranen | Informational |  |  | 
   
    | 6587 | Transmission of Syslog Messages over TCP | R. Gerhards, C. Lonvick | Historic |  |  | 
   
    | 6588 | A URN Namespace for ucode | C. Ishikawa | Informational |  |  | 
   
    | 6589 | Considerations for Transitioning Content to IPv6 | J. Livingood | Informational |  |  | 
   
    | 6590 | Redaction of Potentially Sensitive Data from Mail Abuse Reports | J. Falk, Ed., M. Kucherawy, Ed. | Proposed standard |  |  | 
   
    | 6591 | Authentication Failure Reporting Using the Abuse Reporting Format | H. Fontana | Proposed standard |  | RFC 6692 | 
   
    | 6592 | The Null Packet | C. Pignataro | Informational |  |  | 
   
    | 6593 | Service Undiscovery Using Hide-and-Go-Seek for the Domain Pseudonym System (DPS) | C. Pignataro, J. Clarke, G. Salgueiro | Experimental |  |  | 
   
    | 6594 | Use of the SHA-256 Algorithm with RSA, Digital Signature Algorithm (DSA), and Elliptic Curve DSA (ECDSA) in SSHFP Resource Records | O. Sury | Proposed standard |  |  | 
   
    | 6595 | A Simple Authentication and Security Layer (SASL) and GSS-API Mechanism for the Security Assertion Markup Language (SAML) | K. Wierenga, E. Lear, S. Josefsson | Proposed standard |  |  | 
   
    | 6596 | The Canonical Link Relation | M. Ohye, J. Kupke | Informational |  |  | 
   
    | 6597 | RTP Payload Format for Society of Motion Picture and Television Engineers (SMPTE) ST 336 Encoded Data | J. Downs, Ed., J. Arbeiter, Ed. | Proposed standard |  |  | 
   
    | 6598 | IANA-Reserved IPv4 Prefix for Shared Address Space | J. Weil, V. Kuarsingh, C. Donley, C. Liljenstolpe, M. Azinger | Best current practice |  |  |