Port 201AppleTalk Routing
AppleTalk Routing Maintenance (RTMP) port is used for maintaining and updating routing tables within AppleTalk networks. This service facilitates route discovery, management, and the dissemination of route updates ensuring seamless data delivery across interconnected Apple devices. Primarily, it helps routers to advertise their network reachability and adapt to topology changes dynamically..
- transport
- tcp · udp
- in transit
- cleartext
- assignment
- official
- risk
- 4/10
- lookups
- 19,672
2 transports registered
payload readable on path
registered with iana
caution
rank 129 of 993 · top 13%
Technical Details
what runs on :201AppleTalk Routing Maintenance, leveraging the Routing Table Maintenance Protocol (RTMP), operates over port 201 to support dynamic routing across AppleTalk-based networks. RTMP enables routers to periodically broadcast their routing tables, allowing connected devices and routers to stay aware of the most efficient transmission paths within the AppleTalk ecosystem.
At a technical level, RTMP packets are transmitted every 10 seconds to inform neighboring routers about reachable networks and any changes in network topology. These packets carry detailed route information, including hop counts and network identifiers, promoting effective path recalculation whenever the network infrastructure changes.
Historically, AppleTalk played a critical role in enabling Mac-based connectivity for file sharing, printing, and service discovery. While its use has significantly declined in favor of IP-based protocols, understanding RTMP and its reliance on port 201 remains vital for backward compatibility and in specialized legacy systems that still employ AppleTalk routing.
Security Information
exposure of :201risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
network services averages 3.9 across 604 ports — this one sits 0.1 above.
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
tcp · udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common Vulnerabilities:
- Lack of encryption makes RTMP communications susceptible to eavesdropping and route information tampering.
- Man-in-the-middle attacks can manipulate routing tables, leading to traffic interception or denial of service.
- Unauthorized access by attackers exploiting open port 201 can disrupt routing or gain insights into network topology.
Common Mitigations:
- Disable AppleTalk and its routing services in environments where not explicitly required.
- Employ strict access control lists (ACLs) and firewall rules to restrict incoming and outgoing traffic over port 201.
- Segment legacy AppleTalk infrastructure from sensitive parts of the network using VLANs or separate subnets.
- Monitor network activity for anomalous routing updates or suspicious access attempts aimed at port 201.
- Transition legacy systems to modern, secure IP-based protocols whenever feasible.
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risk mix of the 8 listed
- caution100%
0 of 8 encrypted