Blacklist wiki · Retired
SORBS
SORBS (Spam and Open Relay Blocking System) is one of the oldest and most comprehensive DNS blacklists. It maintains multiple sub-lists for different types of abuse including spam, open relays, dynamic IPs, and web exploits.
- Zone
- Widely used
- Tier
- Author
At a glance
- Zone
- dnsbl.sorbs.net
- Tier
- Widely used. Referenced by many corporate filters and ISPs, usually as one signal among several. A listing costs you some recipients, and a scan reports it as a warning.
- What it lists
- Spam sources, open relays, open proxies, dynamic/residential IPs, and web exploit sources.
- Impact
- Medium-High: widely referenced by email filters and ISPs. Multiple sub-lists target different abuse types.
- How to check
- Nothing to check: the zone no longer answers queries.
- How to delist
- No need: a list that has shut down holds no listings.
- Auto-expiry
- Varies by sub-list. Some require manual removal requests.
How to get delisted
Kept for reference: this list no longer operates.
- 01Visit the SORBS lookup page and check your IP
- 02Identify which specific SORBS sub-list you appear on
- 03For spam listings: Stop the spam source and request removal
- 04For DUL (dynamic IP) listings: Set up a proper reverse DNS (PTR) record
- 05Follow SORBS' specific delisting procedure for your listing type