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what I've heard from multiple sources is that landlines when you provision them, by default they get marked as a published number. if you provision the line and
by jijji 4y ago
what I've heard from multiple sources is that landlines when you provision them, by default they get marked as a published number. if you provision the line and you mark it as a non-published number, usually you're not going to get these types of spam calls everyday. I think what's going on is that there's a automated campaign that's been going on for probably over a decade or two but where people are purchasing a daily list of published numbers from the telecom providers themselves and then they're using that in their spam campaigns.
- walrus01 4y agomore simply they're just robodialing every number in a NPA-NXX, there's no daily list of published numbers. what prefixes in blocks of 10000 numbers belong to what specific carrier is public info
- criddell 4y agoNow that you can port your number between carriers, what meaning does the prefix have anymore?
- walrus01 4y agoonly a little bit, older prefixes like in 206-xxx and 360-xxx that are assigned to legacy copper POTS ILEC carriers (like Centurylink for big parts of the seattle area, or Ziply for the suburbs) are more likely to be fixed landline phones and not ported out somewhere else. prefixes that are assigned to a carrier like tmobile or that were a metropcs prefix before its full integration into tmobile are highly likely to be cellphones, though people can of course port away their number to a voip service or something, but more often they would just move to verizon or att.
- Thetawaves 4y agoThe prefix is relevant for LEC ownership and management duties. Default routing is derived/provisioned by thousands block. Not all call lookups require a lookup into the number portability database. Telephone numbers are highly regulated; usage, growth, etc are tracked by prefix and reported by carriers to NANPA on a yearly basis.
- pishpash 4y agoSo carriers should implement DDOS firewalls.