has new sending IP addresses

American multinational telecommunications conglomerate Comcast, most well-known to us Internet users here in the US as the provider of cable modem-based internet service Xfinity, has announced that they'll be sending outbound mail from subscribers via new (additional) IP addresses ranges.

On the Mailop list, a representative from Comcast shared that the new IP ranges are as follows:

  • ip4: ip4: ip4:
  • ip6:2001:558:fd01:2bb4::/64 ip6:2001:558:fd00:56::/64 ip6:2001:558:fd02:2446::/64

These are indeed included in the SPF record.

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