Cybersecurity Brand
Instantly signals deep technical expertise. Perfect for security researchers, pen-testers, CTF platforms, and vulnerability databases. The address hackers recognize at a glance.
Premium Domain For Sale
0x00007fffffffffff.pw
The highest canonical userspace memory address in 64-bit systems — encoded as a domain. Rare. Technical. Unforgettable.
01
Why This Domain?
Systems & Low-Level
Speak directly to OS engineers, kernel developers, and embedded systems professionals. Build your brand at the boundary between userspace and the kernel.
Web3 & Crypto Native
Hexadecimal notation is the language of blockchain. Wallet addresses, contract bytecode, IPFS CIDs — this domain lives in that world. A natural fit for DeFi, NFTs, and decentralized protocols.
Instantly Memorable
Engineers who see this domain never forget it. The maximum canonical address is a number every systems programmer knows. That recognition is your unfair marketing advantage.
IPFS / Distributed Web
CIDs, content hashes, and peer IDs all live in hex-space. Host a decentralized site, a gateway, or a content-addressed archive under a domain that speaks the same language.
One of a Kind
There is only one 0x00007fffffffffff. No .com alternative. No close second. Own the exact maximum userspace address as a domain — forever.
02
Decode the Address
Hexadecimal
0x00007FFFFFFFFFFF
18 hex digits including 0x prefix
Decimal
140,737,488,355,327
~140.7 trillion
Binary width
47 bits set
All 1s in bits 0–46
Significance
Max Userspace
Top of canonical 64-bit address space
Memory ceiling
128 TiB
Linux x86-64 userspace limit
TLD
.pw
Palau — globally recognized ccTLD
03
Domain Specs
| Full Domain | 0x00007fffffffffff.pw |
| TLD | .pw (Palau country-code) |
| Character Class | Hexadecimal + alphanumeric |
| Label Length | 18 characters |
| Format | Standard 0x-prefixed hex notation |
| Value Represented | Maximum 47-bit canonical virtual address (x86-64) |
| Cultural Significance | Hacker / systems / blockchain community icon |
| Listed Via | Unstoppable Domains Marketplace |
Claim the Ceiling.
One domain. Zero duplicates. The maximum address in userspace — available now. Don't let someone else own it.