There are total 4 records in domain name system (DNS) of passport.yandex.ru, which includes 1 Address(A) record, 1 IPv6 Address(AAAA) record, 1 Mail Exchange(MX) record and 1 Text(TXT) record.
Host Name of the node to which this record pertains
Type Type of resource record in symbolic representation.
TTL Count of seconds that the resource record stays valid.
Extra Info Additional resource record-specific data
A Address Record: A 32-bit IPv4 address, most commonly used to map hostnames to an IP address of the host, but also used for DNSBLs, storing subnet masks in RFC 1101.
AAAA IPv6 Address Record: A 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.
MX Mail Exchange Record: Maps a domain name to a list of message transfer agents for that domain.
TXT Text Record: Originally for arbitrary human-readable text in a DNS record. Since the early 1990s, however, this record more often carries machine-readable data, such as specified by RFC 1464, opportunistic encryption, Sender Policy Framework, DKIM, DMARC DNS-SD.