The address the internet sees when your network sends traffic, and what can be determined about it from a DNS lookup alone.
Every server you reach logs this address. Rate limits, geo-restrictions and access rules are applied against it, and so is any reputation the address has accumulated — including reputation earned by whoever held it before you.
Yours has no PTR record. Receiving mail servers treat a missing or generic PTR as a weak signal against you. On leased space you set your own.
If an address is on a DNS blocklist, mail bounces and some networks drop the traffic entirely. That reputation belongs to the address, not to you — which is why it is worth checking a block before you rely on it.
The address the rest of the internet sees when your network sends traffic. It is assigned by your ISP or hosting provider, and it is what a remote server logs, rate-limits and — if something goes wrong — blocklists.
Most residential and mobile connections use dynamic addressing, so the address is reassigned periodically. Business connections and hosted servers usually have static addresses, which is what you need if anything is going to point DNS at you or allow-list you.
A PTR record maps an address back to a hostname. Receiving mail servers check it, and an address with no PTR or a generic one from the ISP is treated with more suspicion than one with a matching forward and reverse record. Every block leased through IPv4 Hub lets you set your own reverse DNS.
A DNS blocklist check queries each list for that address. RepRadar does this against 25 live lists and keeps monitoring rather than telling you once — which matters, because a listing that appears the day after you check is the one that causes the outage.
Yes — that is what leasing is. You get exclusive use of a block for a fixed term, with the authorisation your upstream needs to route it, while the registration stays with its owner.
Lease a clean, verified IPv4 block with reverse DNS you control and blacklist monitoring included — without buying it.