Autonomous system
AS28605 Defferrari Informatica Ltda.
Residential APNIC
Summary
Defferrari Informática
isp residential brazil cable
AS28605 is operated by Defferrari Informática Ltda., a regional Brazilian internet service provider.
What it's used for
- The address space carries residential and business access traffic, evidenced by reverse DNS records pointing to
rev.defferrari.com.brfor both IPv4 blocks. - The AS announces 5120 IPv4 addresses across 2 prefixes and 5 IPv6 prefixes, while maintaining 25 observed neighbours. This ratio of moderate address space against a significant number of peering partners suggests a regional access network with multiple upstream or peering relationships rather than a pure transit provider.
Notable
- Registrants for both announced IPv4 prefixes (
201.20.144.0/20and179.127.112.0/22) are listed as Defferrari Informatica Ltda., matching the AS holder. - The operator is also known as DSI Internet, a regional cable/DSL provider in Brazil.
- The inventory consists of two distinct IPv4 blocks and a fragmented set of IPv6 prefixes, including a large
/40and several/48allocations.
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 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| IX.br (PTT.br) Porto Alegre | Porto Alegre, Brazil | 177.52.38.34 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 5.12K addresses IPv6 52 prefixes
| Country | Name | Prefixes |
|---|---|---|
| BR | Brazil | 54 |
Registry
Allocation record
- Registry
- APNIC
- Handle
28605- Registry name
- ASN28605
- Registrant
- Defferrari Informatica Ltda.
- Abuse contact
- Marco Defferrari
- Registered
- 2005-07-26
- Last changed
- 2013-03-06
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 19 valid, 0 with no ROA
- ROAs
- 3 authorising AS28605
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 19 announcements
- Route objects
- 0 naming AS28605
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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