Shortened to HN, the Hero Network is the professional back channel of the hero industry: an online service locked behind a license, holding activity reports from across the country and letting one hero call in another whose Quirk suits the job.
The Hero Network, commonly shortened to HN, is the online system through which Pro Heroes reach one another. Getting in requires a Professional Hero License, which keeps the service closed to the public.
Activity reports filed by professionals nationwide are stored on the service. A hero working a case can also put out a request for backup, specifically seeking someone whose Quirk fits what the job demands.
The database is not limited to the hero side of the ledger. Villain names and the Quirks attached to them can be looked up through it as well.

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The Hero Network, commonly shortened to HN, is the online system through which Pro Heroes reach one another, storing activity reports filed by professionals from across the country.
Access to the Hero Network requires a Professional Hero License, which keeps the service closed to anyone outside the hero profession.
On the Hero Network, a Pro Hero working a case can put out a request for backup, specifically seeking another hero whose Quirk fits what the job demands.
Yes, the Hero Network's database is not limited to heroes; villain names and the Quirks attached to them can be looked up through it as well.
Who built or maintains the Hero Network is not established in My Hero Academia; only its use by licensed Pro Heroes is shown.
Looking for more on Hero Network? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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