AS11519 Banco Mercantil del Norte S.A., Institucion de Banca Multiple, Grupo Financiero Banorte

This AS is held by Banco Mercantil del Norte S.A., the banking arm of Grupo Financiero Banorte, one of the largest financial groups in Mexico. It carries the group's own corporate and banking network.

What it's used for

• Enterprise connectivity for a bank: branch and data-centre links, online and mobile banking front ends, ATM and payment-network interconnects, and the partner circuits a retail bank depends on.
• RIS sees 9 announced IPv4 prefixes totalling 2,304 addresses, no IPv6, and 4 observed BGP neighbours. Every announcement is a /24. This is a multihomed end site with a modest, tightly controlled address footprint, which is what regulated financial networks tend to look like: they multihome for availability, not to move traffic for anyone else.

Notable

• The prefix registrants split between two names, and that split is the most informative thing in the evidence. Most blocks register to Banco Mercantil del Norte itself, but 200.10.247.0/24 and 200.10.248.0/24 register to Casa de Bolsa Banorte, Grupo Financiero Banorte — the group's brokerage house. Two different legal entities announcing from one AS looks like third-party space until you read the names: both are Banorte subsidiaries. This is intra-group registration, the ordinary residue of a financial group whose bank and brokerage were allocated addresses separately.
• The one address that answers in reverse DNS resolves under gfnorte.com.mx, Grupo Financiero Banorte's own domain, which corroborates the group reading.

Interesting

• The inventory mixes LACNIC-era 200.x and 207.248.x space with a 192.100.234.0/24 from the old Class C swamp, a reminder that Mexican networks of this age often hold blocks issued before LACNIC existed.