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A typical SPF HELO policy v=spf1 a mx ip4:192.0.2.0 -all may execute four or more DNS queries: (1) TXT record (SPF type was obsoleted by RFC 7208), (2) A or AAAA for mechanism a, (3) MX record and (4+) A or AAAA for each MX name, for mechanism mx. Except the first one, all those queries count towards the limit of 10.
Specified as part of the Sender Policy Framework protocol as an alternative to storing SPF data in TXT records, using the same format. It was discontinued in RFC 7208 due to widespread lack of support. [19] [20] NINFO 56 — Used to provide status information about a zone. Requested for the IETF draft "The Zone Status (ZS) DNS Resource Record ...
In the Domain Name System, a LOC record (experimental RFC 1876) [1] is a means for expressing geographic location information for a domain name. It contains WGS84 Latitude , Longitude and Altitude ( ellipsoidal height ) information together with host/ subnet physical size and location accuracy.
Computed as unix time ⁄ (60×60×24) mod 2 10, it can be stored as a two base32 characters, with a recycling period of about 3.5 years. The hash-based message authentication code ( HHH ) is computed against a local secret, but only a part of it is used; for example, storing the first 4 characters of a base64 representation provides 24 bits of ...
The DS record is placed in the parent zone along with the delegating NS records. NSEC (next secure record) Contains a link to the next record name in the zone and lists the record types that exist for the record's name. DNS resolvers use NSEC records to verify the non-existence of a record name and type as part of DNSSEC validation.
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The SPF verifier queries the Domain Name System (DNS) for a matching SPF record, which if it exists will specify the IP addresses authorized by that domain's administrator. The result can be "pass", "fail", or some intermediate result - and systems will generally take this into account in their anti-spam filtering.