Port 319PTP Event Messages
Port 319 is primarily used by the Precision Time Protocol (PTP) to synchronize networked clocks with high precision using event messages. It plays a critical role in environments where accurate timekeeping is essential, such as in telecommunications, financial trading, industrial automation, and power distribution systems..
- transport
- udp
- in transit
- cleartext
- assignment
- official
- risk
- 2/10
- lookups
- 5,396
single transport
payload readable on path
registered with iana
safe
rank 884 of 993 · top 89%
Technical Details
what runs on :319Precision Time Protocol (PTP), standardized as IEEE 1588, aims to synchronize clocks throughout a computer network with sub-microsecond accuracy. Port 319 specifically manages the transfer of event messages essential to this process. These messages include Sync, Delay_Req, and other critical timestamped packets that facilitate highly accurate clock corrections.
PTP operates by designating a master clock, which distributes time information to slave clocks via these event messages. Slave clocks analyze the timing of incoming packets on port 319 and adjust their local clocks accordingly. This bidirectional exchange substantially reduces drift across networked devices, enabling finely tuned operations.
PTP event messages typically use UDP transport over port 319, while general management and signaling messages are transmitted on port 320. The high granularity of timestamps combined with hardware timestamping allows PTP to outperform protocols like NTP in environments demanding ultra-precise synchronization.
Security Information
exposure of :319risk score
2/ 10safe
routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.
network services averages 3.9 across 604 ports — this one sits 1.9 below.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
official
registered with iana for this service — scanners fingerprint it by number
reachable over
udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common vulnerabilities:
- PTP lacks built-in cryptographic protections, making event messages vulnerable to spoofing and man-in-the-middle attacks.
- An attacker could inject false timestamps, leading to incorrect clock synchronization, potentially disrupting time-dependent services.
- Denial of Service (DoS) attacks may flood port 319 with bogus event messages, overwhelming time clients.
Common mitigations:
- Deploy network-level protections such as access control lists (ACLs) to limit PTP traffic to trusted hosts.
- Use IEEE 1588v2 security enhancements or encapsulate PTP within mutually authenticated VPNs for confidentiality and integrity.
- Implement monitoring to detect suspicious patterns on UDP port 319.
- Physically segment or isolate PTP networks when possible to reduce attack surface.
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risk mix of the 8 listed
- caution100%
0 of 8 encrypted