Autonomous system
AS11921 SECRELNET INFORMATICA LTDA
Residential APNIC
Summary
SECRELNET Informatica Ltda
isp legacy
AS11921 is SECRELNET Informática Ltda, an internet provider based in Fortaleza, Ceará, in north-eastern Brazil, trading as Secrel. Registro.br records the ASN as registered in 1999 to a Brazilian company with a Fortaleza administrative contact, so this is a long-lived regional operator rather than reissued space.
What it's used for
RIS shows a real access network of regional size: 36 IPv4 prefixes carrying 28,672 addresses, one IPv6 prefix (2804:1470::/32), and 27 observed neighbours. Twenty-seven peers is the interesting number. It is far too few for a wholesale transit carrier, but far more than the two or three an enterprise or a single-homed reseller keeps — it is the signature of a regional ISP that shows up at a local exchange point and peers directly with the networks around it, which in Fortaleza means IX.br.
The address inventory is entirely LACNIC space (201.49.0.0/18, 200.150.128.0/20, 200.233.64.0/20, 200.194.96.0/21 and their deaggregates), announced with the covering aggregates alongside the more specifics — routine traffic engineering across multiple upstreams, not the scattered multi-RIR pattern of leased address blocks. The company sells fibre internet to homes and buildings in the Fortaleza metro area alongside business services.
Notable
The evidence pack's registrant lookups for these prefixes all failed, which is a gap in the record and not a clearance — nothing here confirms who each block is registered to. The Brazilian company registration, the ASN's own registro.br record and the consistent LACNIC-Brazil addressing are what place this network in Ceará.
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 | 187.16.221.246 |
| IX.br (PTT.br) Fortaleza | Fortaleza, Brazil | 45.68.72.5 |
Transit providers
7 upstream, 0 downstream and 11 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 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 10 prefixes · 28.67K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| BR | Brazil | 11 |
Registry
Allocation record
- Registry
- APNIC
- Handle
11921- Registry name
- ASN11921
- Registrant
- SECRELNET INFORMATICA LTDA
- Abuse contact
- registrobr@secrel.net.br
- Registered
- 1999-11-18
- Last changed
- 2013-03-06
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 52 valid, 0 with no ROA
- ROAs
- 6 authorising AS11921
- ASPA
- no ASPA record
- IRR
- 100% registered · 52 of 52 announcements
- Route objects
- 148 naming AS11921
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: 442 networks and 1,782 prefixes, as published 2026-10-16. 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