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IPC Subgroup
H04L 61/45

Network directories; Name-to-address mapping

Introduced: January 2022

Full Title

Network arrangements, protocols or services for addressing or naming > Network directories; Name-to-address mapping

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

Filing statistics

IPC H04L 61/45 belongs to the parent subclass H04L, which recorded 1,397,397 patent applications worldwide between 2013 and 2023. Annual filings grew from 91,584 in 2013 to 136,803 in 2023 (+49%), peaking at 147,432 applications in 2022. The most active applicants in class H04 are QUALCOMM (97,396 applications), HUAWEI TECHNOLOGIES COMPANY (96,502 applications) and SAMSUNG ELECTRONICS COMPANY (86,981 applications).

Source: EPO PATSTAT, worldwide filings

7 direct subcodes

Child Classifications

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  • H04L 61/4535 using an address exchange platform which sets up a session between two nodes, e.g. rendezvous servers, session initiation protocols [SIP] registrars or H.323 gatekeepers
  • H04L 61/4541 Directories for service discovery
  • H04L 61/4552 Lookup mechanisms between a plurality of directories; Synchronisation of directories, e.g. metadirectories
  • H04L 61/4557 Directories for hybrid networks, e.g. including telephone numbers
  • H04L 61/4588 containing mobile subscriber information, e.g. home subscriber server [HSS]
  • H04L 61/4594 Address books, i.e. directories containing contact information about correspondents

Top Applicants

Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT

  1. QUALCOMM US 97,396
  2. HUAWEI TECHNOLOGIES COMPANY CN 96,502
  3. SAMSUNG ELECTRONICS COMPANY KR 86,981
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
  5. HUAWEI TECHNOLOGIES COMPANY 55,349
  6. LG ELECTRONICS KR 53,649
  7. CANON 33,341
  8. SONY CORPORATION JP 32,761
  9. ZTE CORPORATION CN 32,274
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327