Autonomous system
AS28370 GUIFAMI Informatica Ltda.
Unclassified LACNIC
Summary
3AX Telecom
residential isp brazil access
AS28370 is operated by 3AX Telecom, registered under the legal name GUIFAMI Informática Ltda.
What it's used for
- The address space carries residential broadband access, evidenced by reverse DNS entries such as
ultravelocidade-128.3ax.com.brandultravelocidade-126.3ax.com.br. - The AS announces 9216 IPv4 addresses across 5 prefixes and 12 IPv6 prefixes, while maintaining 48 observed neighbours, a ratio consistent with a regional access provider rather than a transit hub.
Notable
- All RDAP registrants for the announced prefixes are listed as GUIFAMI Informática Ltda., matching the AS holder.
- The operator is identified in peering databases as 3AX Telecom, a regional ISP in Brazil.
- The inventory consists of two /20 blocks and three smaller blocks in the 45.172.0.0/16 range, alongside a large contiguous IPv6 allocation.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| IX.br (PTT.br) São Paulo | São Paulo, Brazil | 187.16.211.189 |
| IX.br (PTT.br) Ribeirão Preto | Ribeirão Preto, Brazil | 200.192.110.2 |
Transit providers
7 upstream, 16 downstream and 42 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 9.22K addresses IPv6 12 prefixes
| Country | Name | Prefixes |
|---|---|---|
| BR | Brazil | 17 |
Registry
Allocation record
- Registry
- LACNIC
- Registered
- 2007-12-18
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 27 valid, 0 with no ROA
- ROAs
- 78 authorising AS28370
- ASPA
- 2 declared providers
- IRR
- 100% registered · 27 of 27 announcements
- Route objects
- 78 naming AS28370
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,771 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere