WHOIS rate limiting

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WHOIS rate limiting provides you with access to the OpenSRS WHOIS server while preventing abuse from unscrupulous users trying to mine data.

Access limits for port 43 WHOIS

The default limit for each IP or IP range is one (1) lookup per second. A daily rate-limit for each IP or IP range has also been set. Contact support to discuss the daily rate-limit applied to your IP.

Daily and per second rate-limits ensure system stability and load management, while still allowing Registrars to perform daily lookups required to properly perform transfers.

WHOIS rate limit error messages

Message Description
Maximum daily connection limit reached. Lookup refused. Description Maximum daily connection limit reached. Lookup refused. The IP address in question has reached its maximum for communication with the WHOIS server.

Contact support if you feel that this was done in error.
WHOIS lookup refused for this IP range. This IP range is on the OpenSRS block-list for WHOIS lookups. To request that this IP range be removed from the block-list, please send an email to whoisblock@tucows.com. Please include the IP range and a reason why it should be removed from the block-list. Please note that OpenSRS reserves the right to make final determinations on block-list inclusion. The IP address in question has been blocked for perceived abuse of the WHOIS server.

Resellers must follow the instructions and send an email to whoisblock@tucows.com with the IP range and justification for removal from the block list.

As per the message, the request will be investigated, but OpenSRS does not guarantee removal from the block list.
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