open-consul/website/content/docs/install/ports.mdx

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---
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layout: docs
page_title: Required Ports
description: >-
Before starting Consul it is important to have the necessary bind ports
accessible.
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---
# Required Ports
Consul requires up to 6 different ports to work properly, some on
TCP, UDP, or both protocols. Below we document the requirements for each
port.
## Ports Table
Before running Consul, you should ensure the following bind ports are accessible.
| Use | Default Ports |
| ------------------------------------------------------------------------------------------------------------- | ----------------- |
| DNS: The DNS server (TCP and UDP) | 8600 |
| HTTP: The HTTP API (TCP Only) | 8500 |
| HTTPS: The HTTPs API | disabled (8501)\* |
| gRPC: The gRPC API | disabled (8502)\* |
| LAN Serf: The Serf LAN port (TCP and UDP) | 8301 |
| Wan Serf: The Serf WAN port (TCP and UDP) | 8302 |
| server: Server RPC address (TCP Only) | 8300 |
| Sidecar Proxy Min: Inclusive min port number to use for automatically assigned sidecar service registrations. | 21000 |
| Sidecar Proxy Max: Inclusive max port number to use for automatically assigned sidecar service registrations. | 21255 |
\*For `HTTPS` and `gRPC` the ports specified in the table
are recommendations.
## Port Information
**DNS Interface** Used to resolve DNS queries.
**HTTP API** This is used by clients to talk to the HTTP
API.
**HTTPS API** (Optional) Is off by default, but port 8501 is a convention
used by various tools as the default.
**gRPC API** (Optional). Currently gRPC is
only used to expose the xDS API to Envoy proxies. It is off by default, but port 8502 is a convention used by various tools as the default. Defaults to 8502 in `-dev` mode.
**Serf LAN** This is used to handle gossip in the LAN.
Required by all agents.
**Serf WAN** This is used by servers to gossip over the WAN, to
other servers. As of Consul 0.8 the WAN join flooding feature requires
the Serf WAN port (TCP/UDP) to be listening on both WAN and LAN interfaces. See also:
[Consul 0.8.0 CHANGELOG](https://github.com/hashicorp/consul/blob/main/CHANGELOG.md#080-april-5-2017) and [GH-3058](https://github.com/hashicorp/consul/issues/3058)
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**Server RPC** This is used by servers to handle incoming
requests from other agents.
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Note, the default ports can be changed in the [agent configuration](/docs/agent/config/config-files#ports).