Port 1950 is officially registered with IANA under the name ismaeasdaqtest, assigned to both TCP and UDP. Its neighbor, port 1949, carries the label ismaeasdaqlive. Together they once served the live and test environments of a financial market data protocol that is now entirely obsolete.
What Was ISMA Easdaq?
ISMA stands for the International Securities Market Association, a bond market trade association based in Zurich. In the late 1990s, ISMA developed network protocols to distribute market data from Easdaq — the European Association of Securities Dealers Automated Quotation system, a pan-European stock exchange modeled on NASDAQ and launched in 1996.
The live/test port split was conventional practice for financial data systems: port 1949 carried real market data, port 1950 carried test data so that systems integrators could validate their connections without touching production feeds.
Easdaq was acquired by NASDAQ in 2001 and rebranded as NASDAQ Europe. It closed in 2003 after failing to gain traction. ISMA itself merged with ICMA (International Capital Market Association) in 2005 and no longer exists as a separate entity.1
The port registration outlived the exchange, the protocol, and the organization that requested it.
Who Is Using Port 1950 Today?
Almost certainly no one, for its registered purpose. ISMA Easdaq has been defunct for over two decades. No modern financial system uses this protocol.
If you see traffic on port 1950, it is almost certainly an unrelated application that chose this port by configuration or convenience — not an ISMA Easdaq implementation. Security databases have noted that malware has occasionally used port 1950, as attackers sometimes gravitate toward registered-but-dormant ports precisely because they are unlikely to be monitored.2
What Range Does Port 1950 Belong To?
Port 1950 falls in the registered ports range (1024–49151). IANA maintains this range as a registry where organizations can formally request port assignments for their protocols. Registration doesn't mean the protocol is widely used — it means someone asked, and IANA said yes.
Unlike the well-known ports (0–1023), registered ports don't require elevated system privileges to open. Any process can bind to port 1950 on most operating systems.
How to Check What's Listening on Port 1950
If you see activity on this port and want to know what's behind it:
On Linux or macOS:
On Windows:
The process ID returned can be matched against Task Manager or tasklist to identify the application.
To capture traffic:
Why Unassigned and Dormant Ports Matter
The registered port space has thousands of assignments like this one — made for protocols that went nowhere, for companies that no longer exist, for standards that never got adopted. They remain in the registry indefinitely.
This matters for a few reasons:
- Firewall rules that block "registered" ports in bulk can block legitimate traffic elsewhere in the range
- Dormant registrations create confusion — is this traffic legit or suspicious?
- Security scanners often flag activity on unrecognized registered ports, which is the correct instinct
If port 1950 is active on your network and you're not running anything that should use it, that's worth investigating. The ISMA Easdaq client is definitely not the explanation.
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