diff --git a/plugins/module_utils/proxmox_api.py b/plugins/module_utils/proxmox_api.py
new file mode 100644
index 0000000..089e867
--- /dev/null
+++ b/plugins/module_utils/proxmox_api.py
@@ -0,0 +1,76 @@
+from dataclasses import dataclass
+from typing import List, Tuple
+
+import requests
+
+API_BASE_PATH: str = "/api2/json"
+
+
+@dataclass()
+class ProxmoxAuthInfo:
+    instance_url: str
+    token_id: str
+    secret: str
+    verify_cert: bool = True
+
+
+@dataclass(frozen=True)
+class ProxmoxRealm:
+    type: str
+    realm: str
+    comment: str = None
+    default: bool = False
+
+
+def get_realms(auth_info: ProxmoxAuthInfo) -> List['ProxmoxRealm']:
+    realm_answer = _proxmox_request('get', '/access/domains', auth_info).json()
+    return list(map(
+        lambda r: ProxmoxRealm(r['type'], r['realm'], r.get('comment', None), r.get('default', False)),
+        realm_answer['data']
+    ))
+
+
+def set_realm_data(auth_info: ProxmoxAuthInfo, realm: str, config: dict[str, str], dry_run: bool, state: str = 'present') -> Tuple[dict, dict]:
+    existing_realm = _proxmox_request('get', f"/access/domains/{realm}", auth_info)
+    existing_realm_data = None
+    new_realm_data = {}
+    if state == 'present':
+        if existing_realm.ok:
+            existing_realm_data = existing_realm.json()['data']
+            if not dry_run:
+                realm_res = _proxmox_request('put', f"/access/domains/{realm}", auth_info, data=config)
+                realm_res.raise_for_status()
+        else:
+            if not dry_run:
+                realm_res = _proxmox_request('post', '/access/domains', auth_info, data=(config | {'realm': realm}))
+                realm_res.raise_for_status()
+        if not dry_run:
+            if realm_res.ok:
+                new_realm_data = _proxmox_request('get', f"/access/domains/{realm}", auth_info).json()['data']
+        else:
+            new_realm_data = config | {'name': realm}
+    else:
+        if existing_realm.ok:
+            existing_realm_data = existing_realm.json()['data']
+            if not dry_run:
+                realm_res = _proxmox_request('delete', f"/access/domains/{realm}", auth_info)
+                realm_res.raise_for_status()
+                if realm_res.ok:
+                    new_realm_data = None
+            else:
+                new_realm_data = None
+        else:
+            new_realm_data = None
+    return existing_realm_data, new_realm_data
+
+
+def _get_token_from_auth_info(auth_info: ProxmoxAuthInfo) -> str:
+    return f"PVEAPIToken={auth_info.token_id}={auth_info.secret}"
+
+
+def _proxmox_request(method: str, endpoint: str, auth_info: ProxmoxAuthInfo, **params):
+    return requests.request(method,
+                            f"{auth_info.instance_url}{API_BASE_PATH}{endpoint}",
+                           headers={'Authorization': _get_token_from_auth_info(auth_info)},
+                           verify=auth_info.verify_cert,
+                           **params)
diff --git a/plugins/modules/realm.py b/plugins/modules/realm.py
new file mode 100644
index 0000000..47c8d9f
--- /dev/null
+++ b/plugins/modules/realm.py
@@ -0,0 +1,161 @@
+#!/usr/bin/python
+# coding: utf-8
+
+# (c) 2022, Johanna Dorothea Reichmann <transcaffeine@finally.coffee>
+
+__metaclass__ = type
+
+import dataclasses
+import json
+import traceback
+
+from ansible.module_utils.basic import AnsibleModule
+
+LIB_IMP_ERR = None
+try:
+    from ansible_collections.finallycoffee.proxmox.plugins.module_utils.proxmox_api import *
+    HAS_LIB = True
+except:
+    HAS_LIB = False
+    LIB_IMP_ERR = traceback.format_exc()
+
+
+DOCUMENTATION = r'''
+---
+module: realm
+author:
+- Johanna Dorothea Reichmann (transcaffeine@finally.coffee)
+requirements:
+    - python >= 3.9
+short_description: Configures an authentication realm in a proxmox node
+description:
+    - "Configue realm in a proxmox instance"
+options:
+    proxmox_instance:
+        description: Location of the proxmox API with scheme, domain name/ip and port, e.g. https://localhost:8006
+        type: str
+        required: true
+    proxmox_api_token_id:
+        description: The token ID containing username, realm and token name (format: user@realm!name)
+        type: str
+        required: true
+    proxmox_api_secret:
+        description: The secret
+        type: str
+        required: true
+    proxmox_api_verify_cert:
+        description: If the certificate presented for `proxmox_instance_url` should be verified
+        type: bool
+        required: false
+        default: true
+    name:
+        description: Realm to retrieve information about. If left omitted, return all realms
+        type: str
+        required: false
+    config:
+        description: Configuration of the realm, including it's `type`. See https://pve.proxmox.com/pve-docs/api-viewer/index.html#/access/domains for a list of config options
+        type: dict[str, str]
+        required: true
+    state:
+        description: If the realm should be present or absent
+        type: str
+        choices: [present, absent]
+        default: present
+        required: false
+'''
+
+EXAMPLES = r'''
+- name: Configure LDAP realm
+  finallycoffee.proxmox.realm:
+    proxmox_instance: https://my.proxmox-node.local:8006
+    promox_api_token_id: root@pam!token
+    proxmox_api_secret: supersecuretokencontent
+    realms: org_ldap
+    config:
+      type: ldap
+      comment: Long description of the authentication source
+      base_dn: dc=myorg,dc=de
+      bind_dn: uid=proxmox,dc=services,dc=myorg,dc=de
+      passwort: supersecret
+      mode: ldap
+      server1: ldap.myorg.de
+      port: 389
+      default: 1
+      user_attr: uid
+- name: Configure OIDC realm
+  finallycoffee.proxmox.realm:
+    proxmox_instance: https://my.proxmox-node.local:8006
+    promox_api_token_id: root@pam!token
+    proxmox_api_secret: supersecuretokencontent
+    realm: external_oidc
+    config:
+      type: openid
+      issuer-url: https://idp.my-org.de/issuer
+      client_id: myapp
+      client_key: secret
+      scopes: profile email
+      username-claim: sub
+'''
+
+RETURN = r'''
+realm:
+    description: The updated/created realm
+    returned: When realms were found (matching the filter)
+    type: list
+    elements: dict[str, str, str, str]
+
+'''
+
+
+def main():
+    _ = dict
+    module = AnsibleModule(
+        argument_spec=_(
+            proxmox_instance=_(required=True, type='str'),
+            proxmox_api_token_id=_(required=True, type='str'),
+            proxmox_api_secret=_(type='str', required=True, no_log=True),
+            proxmox_api_verify_cert=_(type='bool', required=False, default=True),
+            name=_(required=True, type='str'),
+            config=_(required=True, type='dict'),
+            state=_(type='str', required=False, default='present', choices=['present', 'absent'])
+        ),
+        supports_check_mode=True
+    )
+
+    result = _(
+        changed=False,
+        diff={},
+        message=''
+    )
+
+    realms = []
+    try:
+        realm_change = set_realm_data(ProxmoxAuthInfo(
+            module.params['proxmox_instance'],
+            module.params['proxmox_api_token_id'],
+            module.params['proxmox_api_secret'],
+            module.params['proxmox_api_verify_cert'],
+        ),
+        module.params['name'],
+        module.params['config'],
+        module.check_mode,
+        module.params['state'])
+    except IOError as owie:
+        result['msg'] = owie
+        module.exit_json(**result)
+
+    diff_excluded_keys = ['name', 'password', 'digest']
+    result['realm'] = realm_change[1]
+    result['diff'] = {
+        'before_header': f"{realm_change[0].get('name', module.params['name'])}@{realm_change[0]['type']}" if realm_change[0] and 'type' in realm_change[0] else '',
+        'after_header': f"{realm_change[1].get('name', module.params['name'])}@{realm_change[1]['type']}" if realm_change[1] and 'type' in realm_change[1] else '',
+        'before': {k: v for k, v in realm_change[0].items() if k not in diff_excluded_keys} if realm_change[0] else realm_change[0],
+        'after': {k: v for k, v in realm_change[1].items() if k not in diff_excluded_keys} if realm_change[1] else realm_change[1],
+    }
+    result['changed'] = realm_change[0] != realm_change[1]
+
+    module.exit_json(**result)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/plugins/modules/realm_info.py b/plugins/modules/realm_info.py
new file mode 100644
index 0000000..e426208
--- /dev/null
+++ b/plugins/modules/realm_info.py
@@ -0,0 +1,124 @@
+#!/usr/bin/python
+# coding: utf-8
+
+# (c) 2022, Johanna Dorothea Reichmann <transcaffeine@finally.coffee>
+
+__metaclass__ = type
+
+import dataclasses
+import traceback
+
+from ansible.module_utils.basic import AnsibleModule
+
+LIB_IMP_ERR = None
+try:
+    from ansible_collections.finallycoffee.proxmox.plugins.module_utils.proxmox_api import *
+    HAS_LIB = True
+except:
+    HAS_LIB = False
+    LIB_IMP_ERR = traceback.format_exc()
+
+
+DOCUMENTATION = r'''
+---
+module: realm_info
+author:
+- Johanna Dorothea Reichmann (transcaffeine@finally.coffee)
+requirements:
+    - python >= 3.9
+short_description: Get configured realms of a proxmox node
+description:
+    - "Lists all configured realms in a proxmox instance"
+options:
+    proxmox_instance:
+        description: Location of the proxmox API with scheme, domain name/ip and port, e.g. https://localhost:8006
+        type: str
+        required: true
+    proxmox_api_token_id:
+        description: The token ID containing username, realm and token name (format: user@realm!name)
+        type: str
+        required: true
+    proxmox_api_secret:
+        description: The secret
+        type: str
+        required: true
+    proxmox_api_verify_cert:
+        description: If the certificate presented for `proxmox_instance_url` should be verified
+        type: bool
+        required: false
+        default: true
+    realm:
+        description: Realm to retrieve information about. If left omitted, return all realms
+        type: str
+        required: false
+'''
+
+EXAMPLES = r'''
+- name: Retrieve all reams
+  finallycoffee.proxmox.realm_info:
+    proxmox_instance: https://my.proxmox-node.local:8006
+    promox_api_token_id: root@pam!token
+    proxmox_api_secret: supersecuretokencontent
+- name: Retrieve realm information for 'myrealm'
+  finallycoffee.proxmox.realm_info:
+    proxmox_instance: https://my.proxmox-node.local:8006
+    promox_api_token_id: root@pam!token
+    proxmox_api_secret: supersecuretokencontent
+    realm: myrealm
+'''
+
+RETURN = r'''
+realms:
+    description: The retrieved realms
+    returned: When realms were found (matching the filter)
+    type: list
+    elements: dict[str, str, str, str]
+
+'''
+
+
+def main():
+    _ = dict
+    module = AnsibleModule(
+        argument_spec=_(
+            proxmox_instance=_(required=True, type='str'),
+            proxmox_api_token_id=_(required=True, type='str'),
+            proxmox_api_secret=_(type='str', required=True, no_log=True),
+            proxmox_api_verify_cert=_(type='bool', required=False, default=True),
+            realm=_(required=False, type='str'),
+        ),
+        supports_check_mode=True
+    )
+
+    result = _(
+        changed=False,
+        diff={},
+        message=''
+    )
+
+    realms = []
+    try:
+        realms = get_realms(ProxmoxAuthInfo(
+            module.params['proxmox_instance'],
+            module.params['proxmox_api_token_id'],
+            module.params['proxmox_api_secret'],
+            module.params['proxmox_api_verify_cert'],
+        ))
+    except IOError as owie:
+        result['msg'] = owie
+        module.exit_json(**result)
+
+    result['realms'] = list(
+        map(lambda r: dataclasses.asdict(r),
+            filter(lambda r: r.realm == module.params['realm']
+                    if module.params['realm'] is not None
+                    else True,
+               realms)
+            )
+    )
+
+    module.exit_json(**result)
+
+
+if __name__ == '__main__':
+    main()