threat-intel RCS and DNS: The NAPTR Record, (Mon, Jul 6th) This article details the observation of NAPTR records being utilized in RCS (Rich Communication Services) communications, specifically within Verizon’s network. NAPTR records, defined in RFC 2915, are typically used to return URIs instead of IP addresses. In this case, the records are being used to facilitate secure SI… SANS Internet Storm Center · Jul 6, 2026 Medium USrcsdnsnaptr