Unverified50% confidenceFactExact time
According to DNS specification RFC 1035, domain name labels only allow letters, digits, and hyphens, totaling approximately 63 legal characters including the dot separator.
1
Sources
50%
Confidence
Long-term
Relevance
9/10/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedRFC 1035 defines the DNS message compression mechanism, which uses 2-byte pointers to reference repeated domain names in order to save packet space.65% similarUnverifiedUnder the RFC 5321 email standard, the local-part of a mailbox address is theoretically case-sensitive and every character is significant, including dots.62% similarUnverifiedTXT记录最初在RFC 1035中定义，设计目的是存储与域名相关的任意文本信息60% similarUnverified只有域名的实际管理者才能修改其DNS记录，这为售卖信息真实性提供了基本保障57% similarUnverifiedDKIM公钥以'选择器._domainkey.域名'的格式存储在DNS记录中56% similar
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