AS4996 SBI

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.