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enode is the URI for an ethereum node, consisting of node-id-in-hex@ip-address:port. Here are 2 enode examples:

 enode://6f8a80d14311c39f35f516fa664deaaaa13e85b2f7493f37f6144d86991ec012937307647bd3b9a82abe2974e1407241d54947bbb39763a4cac9f77166ad92a0@10.3.58.6:30303?discport=30301
 enode://a32e5f06c1523c42d732ab8b9bdf569a75d1dad0581ba734b8cc99c5876758132a9b0807b26d79d45cada1a0064db5680efc71350f6030d9a9b1e0a589ef9315@127.0.0.1:30303

The ip-address is the IP address of the node, such as 10.3.58.6 in first enode example. But what does the 127.0.0.1 mean in 2nd example above? 127.0.0.1 is the localhost itself and can not be any other node.

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This means the node was incorrectly configured by its owner and advertised the localhost instead of the IP visible from anyone on the internet. It may come from a setup where the user ran multiple nodes on a single machine for a private network, for dev purpose. But it can be a mistake. Hard to say without more info on where you found these enode addresses.

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