Enum RecordClass 

#[non_exhaustive]
pub enum RecordClass {
    Reserved,
    IN,
    CH,
    HS,
    NONE,
    ANY,
    ReservedMax,
    Unknown(u16),
}

Available on crate features dns and std only.

A DNS resource-record class from the IANA DNS CLASSes registry.

Internet traffic uses RecordClass::IN almost exclusively; the remaining values appear in query-only classes and in dynamic-update prerequisites. Unassigned, private-use, and future values are retained by RecordClass::Unknown.

This list reflects a snapshot of the IANA DNS CLASSes registry taken on 2026-09-16.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Reserved

Provides the reserved class-zero marker, never for ordinary records.

IN

Identifies the Internet class.

CH

Identifies the Chaos class.

HS

Identifies the Hesiod class.

NONE

Requires, in an update prerequisite, that records be absent.

ANY

Matches records of any class in a query.

ReservedMax

Reserves class 65535 for future standards action.

Unknown(u16)

Retains an unrecognized numeric value.

Implementations

impl RecordClass

pub fn variant_name(&self) -> Cow<'static, str>

Return this value’s variant name, or its decimal number when the value is unknown.

Known values borrow their 'static mnemonic, and Self::Unknown values render their numeric value. Unlike Display and Debug the result is a bare, stable label, suitable for log fields, metrics, and telemetry.

Trait Implementations

impl Clone for RecordClass

fn clone(&self) -> RecordClass

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RecordClass

impl Debug for RecordClass

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RecordClass

fn deserialize<D>( deserializer: D, ) -> Result<RecordClass, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for RecordClass

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for RecordClass

impl From<RecordClass> for u16

fn from(value: RecordClass) -> u16

Converts to this type from the input type.

impl From<u16> for RecordClass

fn from(x: u16) -> RecordClass

Converts to this type from the input type.

impl Hash for RecordClass

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl LowerHex for RecordClass

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Ord for RecordClass

fn cmp(&self, other: &RecordClass) -> Ordering

Compare by numeric value, then distinguish colliding variants.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for RecordClass

fn eq(&self, other: &RecordClass) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for RecordClass

fn partial_cmp(&self, other: &RecordClass) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for RecordClass

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RecordClass

impl UpperHex for RecordClass

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.