Port 3555Vipul's Razor

Port assigned to Vipul's Razor, a collaborative service for identifying and reporting spam.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

Technical Details

what runs on :3555

IANA assigns this service to both TCP and UDP port 3555. Razor uses an application-level client/server request-and-response protocol to query and report spam fingerprints; it is not an SMTP listener. Known Razor deployments commonly use TCP, and many Razor2 clients are encountered using TCP port 2703 or server-discovery-selected endpoints instead, so an open 3555 listener should be verified by protocol probing rather than assumed to implement a particular UDP mode or standard framing.

Security Information

exposure of :3555

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

security averages 3.1 across 347 ports — this one sits 1.1 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

tcp · udp

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

security overview

A public listener is normally an intentionally exposed anti-spam service, not an administrative interface. Restrict it to the networks and clients that need it where possible, and monitor for resource exhaustion or attempts to submit misleading reputation data; the protocol is not generally treated as a secure remote-control service.

Record

iana registry entry

port: :3555
service: Vipul's Razor
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Security
usage: Vipul's Razor is a collaborative anti-spam system: clients query servers for message signatures and report suspected spam. It is normally encountered as a Razor client connecting to a Razor reputation server, rather than as a general-purpose application service.
lookups: 0rank 993
added: 2026-09-04
updated: 2026-09-22
references: IANA service name registry — port 3555

Something wrong?

This record is maintained by the engineers who use port 3555. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-22.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 347 in security →

the 8 most looked-up other ports in security — 347 ports carry that label.

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:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
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:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
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:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :3555Vipul's Razor

Technical Details

Security Information

Related Ports

Port 3555Vipul's Razor