Port 1216: ETEBAC 5 — The ghost of French banking

Officially assigned to: etebac5 (ETEBAC 5)
Protocol: TCP/UDP
Status: Obsolete (network infrastructure shutdown in 2012)

What ETEBAC 5 Was

ETEBAC 5 (Échange Télématique entre les Banques et leurs Clients version 5) was France's banking communication protocol. Created in 1995, it handled file exchanges between banks and their clients—wire transfers, direct debits, bills of exchange, account statements, payment reports.¹²

When a business needed to send payment instructions to their bank or receive account statements, those files traveled through port 1216 over France's Transpac X.25 packet network.

How It Worked

Transport network: ETEBAC 5 ran over X.25, a packet-switching protocol that France Telecom operated through a network called Transpac.³⁴ This was pre-Internet infrastructure—dedicated circuits, point-to-point connections, the kind of network that felt permanent until it wasn't.

Security: ETEBAC 5 introduced smart card authentication. Banks issued physical smart cards to their clients. Files were encrypted and digitally signed using the card, ensuring both confidentiality and authenticity.⁵⁶ For 1995, this was sophisticated security.

Bidirectional exchange: Unlike earlier protocols that only allowed banks to push data to clients, ETEBAC 5 was bidirectional. Clients could send instructions to banks, and banks could respond—a conversation, not a broadcast.⁷

Why It Disappeared

France Telecom announced in 2009 that X.25 would no longer be commercially marketed and would cease maintenance in 2011. On June 30, 2012, they shut down the Transpac network entirely.⁸⁹

ETEBAC 5 couldn't survive without it. The protocol was tied to X.25's infrastructure—it wasn't designed to run over standard IP networks.

The French banking industry migrated to EBICS (Electronic Banking Internet Communication Standard), which uses standard HTTPS. Migration began in 2010 and was completed by September 2011.¹⁰¹¹ EBICS embedded ETEBAC's message formats and signature elements but transported them over the modern Internet instead of dedicated circuits.

What Happened to Port 1216

When ETEBAC 5 died, port 1216 became a ghost. The port assignment still exists in IANA's registry, but nothing uses it. No modern banking system listens on 1216. No software expects to find ETEBAC 5 there.

If you scan port 1216 on a bank's servers today, you'll find it closed. The protocol that once carried billions of francs and euros through France's financial system is gone.

The Lesson

ETEBAC 5's death wasn't a failure of the protocol itself. It was well-designed, secure, and served France's banking industry for nearly two decades. But it was coupled to infrastructure that couldn't adapt.

When the underlying network disappeared, ETEBAC 5 went with it. The migration to EBICS preserved the message formats and business logic, but the transport layer—the part that used port 1216—was left behind.

Port 1216 is what happens when a protocol is too tightly bound to the network beneath it. The Internet survived because it abstracted away the physical layer. ETEBAC 5 didn't.

Checking Port 1216 Today

You won't find ETEBAC 5 running anywhere. But if you want to check what (if anything) is listening on port 1216:

Linux/macOS:

sudo lsof -i :1216

Windows:

netstat -ano | findstr :1216

Nmap scan:

nmap -p 1216 target-host

You'll almost certainly find nothing. Port 1216 is open space now—a registered address with no tenant.