whatportis.com
suggest an edit →

Port 323Internet Message Mapping Protocol (IMMP)

The Internet Message Mapping Protocol (IMMP) is designed to facilitate message synchronization and mapping between messaging systems, aiding interoperability across disparate email services and platforms. Supporting both TCP and UDP transports, IMMP aligns with multi-environment messaging needs and provides the foundation for translating message metadata effectively. Its use case centers on connecting heterogeneous communication systems without standardized protocols for efficient message delivery..

inEmailNetwork Services
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
9,010

rank 542 of 993 · top 55%

Technical Details

what runs on :323

IMMP, or the Internet Message Mapping Protocol, is a specialized protocol intended to support the mapping and synchronization of email messages across different messaging systems. By serving as a bridge protocol, IMMP can facilitate communication and data translation where email systems use different internal representations. This is particularly useful in complex enterprise environments or within messaging gateways that need to interoperate with multiple email backbones.

Operating over both TCP and UDP ports, IMMP accommodates diverse transport requirements. TCP offers reliable communication essential for message mapping operations requiring transaction integrity, while UDP can provide lightweight, low-latency communication in less critical scenarios. The protocol’s flexibility enables deployment in various network topologies, ensuring that different email systems maintain consistent message states.

IMMP’s packet structure typically encapsulates message metadata—including sender, recipient, timestamps, and flags—to map these attributes correctly between systems. It functions at the application layer, leveraging existing transport layer protocols. Proper integration allows seamless migration, backup, or coexistence of messaging infrastructures with minimal data loss or corruption risks.

Security Information

exposure of :323

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

email averages 3.9 across 42 ports — this one sits 0.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

unofficial

used by convention, not registered — what answers here varies by deployment

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Common vulnerabilities:

  • Unauthorized access risks if IMMP endpoints lack secure authentication mechanisms
  • Susceptibility to man-in-the-middle attacks when transmitted unencrypted, allowing interception and manipulation of message mapping data
  • Injection attacks due to insufficient validation of transferred message metadata
  • Use of UDP may expose to packet spoofing or denial-of-service threats

Common mitigations:

  • Implementing strong access controls and authentication on servers running IMMP
  • Wrapping IMMP communication within secure tunnels such as VPNs or implementing application-layer encryption
  • Enabling input validation and sanitization of message metadata prior to processing
  • Restricting unnecessary UDP access or applying network segmentation and firewalls to minimize attack surfaces
  • Monitoring traffic patterns to detect anomalies indicating scanning or exploitation attempts

Related Ports

all 42 in email →

the 8 most looked-up other ports in email — 42 ports carry that label.

portservicerisk
:143IMAPcaution
:995POP3Scaution
:109POP2caution
:2096cPanel SSL Webmailsafe
:110POP3caution
:993IMAPScaution
:1352Lotus Notes RPCcaution
:24Private Mailcaution

risk mix of the 8 listed

  • safe13%
  • caution88%

3 of 8 encrypted