"The length limit of a DNS TXT record is 255 characters."
Nope. That's the maximum length of a TXT record string. TXT record strings with the same owner name get concatenated together. The maximum for a TXT record is 65,280 octets (which may or may not translate into characters depending on encoding).
Also, you probably want to think about the implications of caching and TTL.
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[ 5.5 ms ] story [ 16.1 ms ] threadNope. That's the maximum length of a TXT record string. TXT record strings with the same owner name get concatenated together. The maximum for a TXT record is 65,280 octets (which may or may not translate into characters depending on encoding).
Also, you probably want to think about the implications of caching and TTL.