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https://www.federalregister.gov/documents/2025/08/04/2025-14681/medicare-program-hospital-…

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http://www.iana.org/numbers.html

…5 RFC 8317 0x00-0x7A: IETF Review. 0x7B-0x7E: Experimental Use. 0x80-0xFA: Composite Tunnel. 0xFB-0xFE: Experimental Use. 0xFF: Standards Action. Region Identifiers (<R>) RFC 4384 Not defined SFC Extended Community Sub-Types RFC 9015 First Come First Served SFC SPI/SI Representat…