---
type: concept
title: Zentrales Adressbuch
tags: [email, ldap, directory-service, university-network]
related: [central-email-service, universitatsrechenzentrum-urz, groupware]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_zentrales_adressbuch.md"]
---

# Zentrales Adressbuch

The **Zentrales Adressbuch** (Central Address Book) is a directory service provided by the [[universitatsrechenzentrum-urz]] that allows university members to query the contact details of employees of the [[universitat-greifswald]].

## Access and Integration
While the address book is integrated into the [[groupware]] webmailer, it can also be configured in any modern email client. 

### Network Restriction
**Critical Requirement**: Access to the central address book via LDAP is restricted to the **university network**. Users attempting to connect from external networks without a VPN or similar university network access will be unable to reach the server.

## Technical Configuration (LDAP)
The service is implemented as an **LDAP Directory Service**. The following settings are used for client-side configuration:

- **Server**: `adressbuch.uni-greifswald.de`
- **Port**: `636`
- **Protocol**: `LDAP v3`
- **Encryption**: TLS/SSL (Ciphers starting from AES 256)
- **Base DN**: `dc=uni-greifswald,dc=de,dc=TLD`

This functionality complements the [[central-email-service]] by providing a standardized way to retrieve employee contact information directly within the user's chosen email application.
