TCP/UDP-Portnummern nachschlagen

FTP-datatcpUnsicher / veraltet

FTP active-mode data channel

FTPtcpUnsicher / veraltet

FTP control; credentials in clear text

SSH / SFTPtcp

Secure shell, SFTP and SCP

TelnettcpUnsicher / veraltet

Unencrypted remote terminal

SMTPtcp

Mail transfer between servers

DNStcpudp

Domain name resolution (UDP, TCP for large answers and zone transfers)

DHCPudp

DHCP server (67) and client (68)

TFTPudpNur intern

Trivial file transfer, PXE boot, switch configs

HTTPtcp

Web traffic, ACME HTTP-01 challenges

KerberostcpudpNur intern

Kerberos authentication (Active Directory)

POP3tcpUnsicher / veraltet

Mail retrieval, unencrypted

rpcbindtcpudpNur intern

ONC RPC portmapper (NFSv3)

NNTPtcpUnsicher / veraltet

Usenet news

NTPudp

Network time synchronisation

MS-RPCtcpNur intern

Microsoft RPC endpoint mapper

NetBIOStcpudpNur intern

NetBIOS name, datagram and session service

IMAPtcp

Mail access, STARTTLS capable

SNMPudpNur intern

SNMP polling of network devices

SNMP trapudpNur intern

SNMP traps sent by devices

BGPtcp

Border Gateway Protocol peering

LDAPtcpudpNur intern

Directory access (Active Directory, OpenLDAP)

HTTPS / QUICtcpudp

TLS web traffic; UDP 443 carries HTTP/3

SMBtcpNur intern

Windows file sharing; never expose to the internet

SMTPStcp

Mail submission over implicit TLS

IKEudp

IPsec VPN key exchange

SyslogudpNur intern

Remote syslog

LPDtcpNur intern

Line printer daemon

RIPudpNur intern

Routing Information Protocol

DHCPv6udp

DHCPv6 client (546) and server (547)

Submissiontcp

Mail submission with STARTTLS (clients send here)

IPP / CUPStcpNur intern

Internet Printing Protocol

LDAPStcpNur intern

LDAP over TLS

DNS over TLS / QUICtcpudp

Encrypted DNS (DoT, DoQ)

rsynctcpNur intern

rsync daemon

FTPStcp

FTP over implicit TLS

IMAPStcp

IMAP over TLS

POP3Stcp

POP3 over TLS

SOCKStcpNur intern

SOCKS proxy

OpenVPNudp

OpenVPN default

SQL ServertcpNur intern

Microsoft SQL Server

OracletcpNur intern

Oracle database listener

L2TPudp

L2TP VPN

PPTPtcpUnsicher / veraltet

PPTP VPN; broken crypto

RADIUSudpNur intern

RADIUS authentication (1812) and accounting (1813)

MQTTtcpNur intern

MQTT broker, unencrypted

SSDP / UPnPudpNur intern

UPnP discovery; abused for amplification

NFStcpudpNur intern

Network File System

ZooKeepertcpNur intern

ZooKeeper client port

Docker APItcpNur intern

Docker daemon without TLS; root access if exposed

Docker TLStcpNur intern

Docker daemon with TLS

etcdtcpNur intern

etcd client (2379) and peer (2380)

Dev server / GrafanatcpNur intern

Common dev server and Grafana default

SquidtcpNur intern

Squid HTTP proxy

AD Global CatalogtcpNur intern

Active Directory global catalog (3269 with TLS)

MySQL / MariaDBtcpNur intern

MySQL and MariaDB

RDPtcpudpNur intern

Windows Remote Desktop; put behind a VPN

STUN / TURNtcpudp

NAT traversal for WebRTC

EPMDtcpNur intern

Erlang port mapper (RabbitMQ clusters)

IPsec NAT-Tudp

IPsec NAT traversal

Docker Registry / FlasktcpNur intern

Docker registry, Flask and many dev servers

SIPtcpudp

VoIP signalling

SIPStcp

SIP over TLS

XMPPtcp

XMPP client connections

mDNSudp

Multicast DNS / Bonjour

PostgreSQLtcpNur intern

PostgreSQL

KibanatcpNur intern

Kibana UI

AMQPtcpNur intern

RabbitMQ AMQP

VNCtcpNur intern

VNC remote desktop (5900 + display number)

WinRMtcpNur intern

Windows Remote Management HTTP (5985) / HTTPS (5986)

RedistcpNur intern

Redis; often unauthenticated

Kubernetes APItcpNur intern

Kubernetes API server

Syslog TLStcp

Syslog over TLS

BitTorrenttcpudp

BitTorrent peers

HTTP alttcp

Alternate HTTP, proxies, Tomcat, Jenkins

InfluxDBtcpNur intern

InfluxDB HTTP API

VaulttcpNur intern

HashiCorp Vault

HTTPS alttcp

Alternate HTTPS, admin panels

ConsultcpNur intern

Consul HTTP API

MQTT TLStcp

MQTT over TLS

MinIO / PHP-FPMtcpNur intern

MinIO S3 API, PHP-FPM, SonarQube

PrometheustcpNur intern

Prometheus server

KafkatcpNur intern

Apache Kafka broker

node_exporter / JetDirecttcpNur intern

Prometheus node exporter; raw printing

ElasticsearchtcpNur intern

Elasticsearch / OpenSearch HTTP API

Elasticsearch transporttcpNur intern

Elasticsearch node-to-node transport

ZabbixtcpNur intern

Zabbix agent (10050) and server (10051)

KubelettcpNur intern

Kubelet API

MemcachedtcpudpNur intern

Memcached; UDP abused for amplification

Minecrafttcp

Minecraft Java server

Steam / Sourcetcpudp

Source engine game servers

MongoDBtcpNur intern

MongoDB

WireGuardudp

WireGuard default