RBL, or DNSBL, stands for "Real-time Black List," and are most often used to publish the addresses of computers or networks linked to spamming, malware, or other abuses which system administrators may want to block from accessing their networks.
There are hundreds of RBLs in existence, which use a wide array of criteria for listing and delisting of addresses. These may include listing the addresses of zombie computers or other machines being used to send spam, listing the addresses of ISPs who willingly host spammers, or listing addresses which have sent spam to a honeypot system.
If the IP addresses of your servers appear on these RBLs, there's a good chance you'll have difficulty interacting with networks that subscribe to these RBLs. For instance, if your SMTP server is listed, you'll likely be unable to send email to anyone who's SMTP server uses the RBL you are listed on.
Each RBL provider determines which IP addresses are on their RBL and what hoops you must jump through to get delisted. NodePing does not provide delisting services. We only provide monitoring and alerts to let you know if your hostnames and IP addresses appear in the RBLs. Below is the list of RBLs we test along with links to help you get your IP addresses delisted.
RBL checks should be run for all servers that send email - including SMTP and web servers - on at least a daily basis. RBL check can test any ipv4 address or FQDN.
To set up an RBL check,
Currently only IPv4 addresses are supported.