Autonomous system
AS4996 SBI
Unclassified ARIN
Summary
Citigroup Inc.
enterprise finance legacy
AS4996 is registered to Citigroup Inc., the global bank, under the ARIN handle SBI. The handle is inherited from Salomon Brothers Inc., the Wall Street investment bank whose successor entities were absorbed into Citigroup.
What it's used for
This is a corporate enterprise network, not a service-provider one. The address space supports Citigroup's own internal and market-facing systems: trading and banking infrastructure, corporate offices, and the internet-facing edge of an institution that runs its own multi-homed connectivity rather than renting it.
Notable
Large banks are among the oldest non-academic, non-carrier holders of AS numbers. They needed independent, provider-agnostic routing early because market-data feeds, exchange connectivity, and inter-bank links could not be allowed to depend on any single upstream. ARIN records this ASN's registration in 1995, consistent with a bank building its own routed presence during that first wave.
The registry address on the record points to a New Jersey technology site rather than a headquarters, which is typical: banks register number resources against the operations campus that actually runs the network.
Interesting
The SBI handle is a small piece of Wall Street history left in the routing registry. Salomon Brothers became Salomon Smith Barney, then passed through the Travelers merger into Citigroup, and the handle simply followed the assets. Handles routinely outlive the companies that created them.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
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 16 prefixes · 5.12K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 16 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4996- Registry name
- SBI
- Registrant
- Citigroup Inc.
- Abuse contact
- domain.admin@citi.com
- Registered
- 1995-05-31
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 20 with no ROA
- ROAs
- 0 authorising AS4996
- ASPA
- no ASPA record
- IRR
- 10% registered · 2 of 20 announcements 18 other origin
- Route objects
- 11 naming AS4996
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: 442 networks and 1,781 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