A follow up from a comment on this answer.
What are seednodes, and how do they differ from fallback nodes?
asked May 17, 2012 at 20:36
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2 Answers
"Fallback nodes" is a page on the Bitcoin Wiki which lists some reliable Bitcoin nodes. "DNS Seeds" are DNS servers hard-coded into Bitcoin which return IP addresses of Bitcoin nodes which can be used for bootstrapping. "Seednodes" are Bitcoin nodes which have their IP addresses hard-coded into the Bitcoin client (see list here); they're used as an alternative bootstrapping method.
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This link from your answer is (three years later) rotten. Fixed link (based on post date). Commented Apr 10, 2015 at 19:55
DNS seeds aren't necessarily "seednodes" as they don't necessarily have have Bitcoin running as well. Instead these hosts have standard DNS servers with A records that new Bitcoin nodes use for bootstrapping to learn of peers.
Currently, Bitcoin master shows these four:
- bitseed.xf2.org
- dnsseed.bluematt.me
- seed.bitcoin.sipa.be
- dnsseed.bitcoin.dashjr.org
Source code:
https://github.com/bitcoin/bitcoin/blob/master/src/net.cpp#L1170
// DNS seeds
// Each pair gives a source name and a seed name.
// The first name is used as information source for addrman.
// The second name should resolve to a list of seed addresses.
static const char *strMainNetDNSSeed[][2] = {
{"bitcoin.sipa.be", "seed.bitcoin.sipa.be"},
{"bluematt.me", "dnsseed.bluematt.me"},
{"dashjr.org", "dnsseed.bitcoin.dashjr.org"},
{"xf2.org", "bitseed.xf2.org"},
{NULL, NULL}
};
answered May 17, 2012 at 21:20
