AS7743 JPMORGAN-AS7743

Autonomous System 7743 (JPMORGAN-AS7743) is a corporate network of **JPMorgan

Chase & Co.**, the largest bank in the United States.

What it's used for

• Carrying the bank's own enterprise infrastructure: corporate offices, datacentres, public-facing banking and payments front ends, and the systems behind its consumer, commercial and investment-banking lines.
• Announcing 159.53.0.0/16 — a legacy Class B registered to the bank in 1992 under the netname JMC — along with a few smaller blocks and IPv6 out of 2620:11::/45-scale space.

Notable

• This is an enterprise network, not a provider. An address in this range is a JPMorgan Chase site or server; none of it is sold as connectivity or hosting.
• Reverse DNS is sparse, and what little resolves is revealing: names such as sdccexsm0.bankone.com still sit in the space. Bank One merged into JPMorgan Chase in 2004, and its DNS naming survived the merger inside the address plan — an ordinary example of how corporate networks accrete the histories of the institutions they absorb.

Interesting

• Large banks are among the heaviest remaining users of legacy Class B space, and they tend to keep it rather than sell into the IPv4 transfer market: the addresses are embedded in decades of firewall rules, allowlists and counterparty configurations, which makes renumbering far more expensive than the addresses are worth.