Most buyers skip IPv4 seller due diligence. That’s the uncomfortable truth. With addresses holding steady at $30\u2013$50 each, a single \/24 means tying up $7,000\u2013$12,000 \u2014 real money, and real incentive for fraud. Some sellers don’t own what they’re selling. Some blocks were hijacked years ago. Others arrive blacklisted beyond repair. All of it is avoidable, if you verify before you wire anything.<\/p>\n
Knowing how the schemes actually work helps you know where to look. These come up again and again in the transfer market:<\/p>\n
Start here. It’s the most authoritative check you have. Every IPv4 block is registered with one of five RIRs \u2014 ARIN, RIPE NCC, APNIC, LACNIC, or AFRINIC \u2014 and each keeps a public WHOIS database.<\/p>\n
Don’t stop at WHOIS. Ask for corporate documents: certificate of incorporation, proof of signatory authority, and where relevant, confirmation that the block wasn’t acquired through fraud or government reclamation. Legacy blocks (pre-RIR space) are their own animal \u2014 check any Legacy Registry Agreements and keep in mind transfer requirements differ by registry.<\/p>\n
Ownership verification tells you the seller can<\/em> sell. Reputation research tells you whether they should be trusted to actually execute.<\/p>\n This is where a vetted marketplace earns its fee. IP4 Market<\/strong>, for instance, verifies every seller’s identity and ownership documentation before a listing goes live \u2014 which takes a good chunk of legwork off your plate while keeping pricing at market levels.<\/p>\n Before any money moves, work through this systematically:<\/p>\n Here’s the catch: a legally clean block can still be operationally toxic. Run the full range through the major DNSBLs (Spamhaus SBL\/DBL, Barracuda Reputation Block List, UCEPROTECT) and pull historical routing data via RIPEstat or similar. Pay attention to:<\/p>\n Budget for a remediation window of 30\u201390 days after the transfer, and once the block is announced under your ASN, notify the major providers proactively. It saves time later.<\/p>\n Even with a legitimate seller, payment structure matters. Never wire funds directly against a promise of transfer \u2014 not once, not for a “trusted” counterparty. The gold standard is a three-party escrow arrangement:<\/p>\n Reputable marketplaces, IP4 Market<\/strong> among them, build escrow protection into every transaction, along with contract templates covering block size, price, transfer timeline, and liability for pre-transfer abuse history. Insist on a written purchase agreement regardless of deal size. Even a \/24 deserves a contract.<\/p>\n How long does IPv4 seller due diligence take?<\/strong><\/p>\n For a straightforward \/24 from a cooperative seller, plan on 3\u20137 business days. Complex legacy blocks or transfers across registries can stretch to several weeks.<\/p>\n Can I recover funds if I’m defrauded?<\/strong><\/p>\n Rarely, and almost never in full. Crypto payments and international wires to shell entities are effectively gone. This is why escrow is non-negotiable.<\/p>\n Are RIR transfers themselves safe?<\/strong><\/p>\n Yes. RIR-reviewed transfers are the safest mechanism available \u2014 the registry validates the seller’s rights and applies policy requirements. The danger sits in private deals that bypass all of it.<\/p>\n What’s the biggest red flag in a seller listing?<\/strong><\/p>\n Below-market pricing paired with urgency (“price goes up Friday,” “three other buyers interested”). Legitimate IPv4 trades almost never require rushed decisions.<\/p>\n<\/div>\n Bottom line:<\/strong> Thorough due diligence \u2014 WHOIS verification, reputation research, blacklist checks, escrow-protected payment \u2014 brings fraud risk close to zero. Buyers who cut corners to save a week often lose the whole investment. A verified marketplace like IP4 Market<\/strong> gives you documented ownership, vetted counterparties, and secure transaction infrastructure from day one.<\/p>\n<\/div>\nRed flags to watch for<\/h3>\n
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Green flags that indicate a legitimate seller<\/h3>\n
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The Pre-Purchase Due Diligence Checklist<\/h2>\n
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\n \nCheck<\/th>\n Source<\/th>\n What a Pass Looks Like<\/th>\n<\/tr>\n<\/thead>\n \n WHOIS ownership match<\/td>\n RIR WHOIS (ARIN, RIPE, APNIC, etc.)<\/td>\n Registrant matches the seller’s legal entity<\/td>\n<\/tr>\n \n Block status<\/td>\n RIR database<\/td>\n ALLOCATED\/ASSIGNED, no disputes or holds<\/td>\n<\/tr>\n \n Transfer eligibility<\/td>\n RIR policies (NRPM 8.x, RIPE-690, etc.)<\/td>\n Seller meets the registry’s transfer requirements<\/td>\n<\/tr>\n \n Abuse history<\/td>\n Spamhaus, Barracuda, UCEPROTECT<\/td>\n Clean or remediable listings<\/td>\n<\/tr>\n \n BGP history<\/td>\n RIPEstat, BGPlay, Hurricane Electric BGP toolkit<\/td>\n Stable, consistent origination history<\/td>\n<\/tr>\n \n Corporate verification<\/td>\n Business registries, secretary of state filings<\/td>\n Active entity, valid signatory<\/td>\n<\/tr>\n \n Payment security<\/td>\n Escrow service<\/td>\n Funds released only after RIR confirms transfer<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Check Blacklists and Prefix History<\/h2>\n
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Use Secure Payment and Escrow Methods<\/h2>\n
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FAQ<\/h2>\n