drupal/core/modules/ban/ban.services.yml

services:
  ban.ip_manager:
    class: Drupal\ban\BanIpManager
    arguments: ['@database']
    tags:
      - { name: backend_overridable }
  ban.subscriber:
    class: Drupal\ban\EventSubscriber\BanSubscriber
    tags:
      - { name: event_subscriber }
    arguments: ['@ban.ip_manager']