Want to know who owns a particular domain name — or check when one expires, who the registrar is, or whether it's actually available? A WHOIS lookup is the quickest way to find out. WHOIS is a public record system — overseen by the Internet Corporation for Assigned Names and Numbers (ICANN) — that stores registration details and lets you find a domain owner, and a single search returns when a domain was registered, when it expires, the registrar managing it, and (where it isn't hidden for privacy) the owner's contact details.
This guide explains what a WHOIS lookup shows, how to read the ownership and registration details, how it works specifically for .co.za and other South African domains, and what's changed in 2026 as the industry shifts from classic WHOIS to the newer RDAP system.
What is a WHOIS lookup?
A WHOIS lookup is a directory service — traditionally answered over port 43 — that queries the WHOIS databases kept by domain registries and registrars and returns the public record for a domain name. Think of it as a title deed for a web address. A typical WHOIS record shows:
- The registrant's (owner's) name and WHOIS contact information, where not redacted for privacy
- The domain's registration and expiry dates
- The registrar that manages the domain
- The nameservers the domain uses
- The domain status, or registration status (active, expired, locked, pending delete, and so on)
That information is useful for far more than curiosity. People use WHOIS data to check that a business or website is legitimate, to see whether a domain they want is already taken, to compare domain registrars before a domain registration, to contact an owner about buying a name, to report abuse or spam, and to research competitors and protect a brand.
How to do a WHOIS lookup, step by step
Running a WHOIS search takes seconds:
- Open a WHOIS lookup tool (most registrars, including Allanux, offer one on their domain search page).
- Type the full domain name — for example example.co.za or example.com — into the search box.
- Submit the search to the WHOIS database. The domain name lookup tool queries the relevant registry and returns the public record.
- Read the results: registration and expiry dates, registrar, nameservers, status and any visible contact details.
If you're checking a name you might want to buy, this free WHOIS lookup doubles as a way to check domain availability: "no match for domain" means it's free to register — and many registrars bundle a free domain, across popular TLDs, with hosting.
How to read WHOIS results
Most records follow the same pattern. The creation date tells you how established a domain is; the expiry date tells you when it's next due for renewal (and when it might become available if the owner lets it lapse — see our guide to the domain name life cycle). The registrar line shows which company the domain is registered through, and the nameservers reveal where the domain's DNS — and usually its hosting — is pointed.
What you often won't see is personal contact information, and that's by design. Since privacy rules tightened, most registrars redact the registrant's name, email and phone number from public WHOIS, showing a generic privacy message instead.
WHOIS for .co.za and South African domains
South African domains work a little differently from global ones. The .co.za namespace (along with .org.za, .net.za and .web.za) is administered by ZADNA, South Africa's domain authority, with the registry operated by the ZA Central Registry. A WHOIS lookup for a .co.za domain returns the same core facts — registration and renewal dates, registrar, nameservers and status — but South African registries apply their own privacy and display rules, so the level of owner detail you see can differ from a .com.
If you're researching or buying a local name, that matters: a .co.za record is the authoritative place to confirm a South African domain's status and registrar before you make an offer or plan a transfer. And if your own .co.za details look wrong in WHOIS, your registrar can correct them — changes usually propagate within 24–48 hours.
Beyond domains: IP address lookup
The same tools that search a domain will usually also look up an IP address. Where a domain search returns registration records for a web address, an IP search tells you which organisation or network an IP belongs to — handy for troubleshooting connectivity, investigating security issues or mapping where a site is hosted. Just enter the domain or IP address in the search tool and read the results: for an IP you'll typically see the network operator, while for a domain you'll see the full registration record, including the creation date and nameservers.
WHOIS in 2026: privacy, GDPR and the move to RDAP
WHOIS isn't quite what it was a decade ago. Two big shifts shape what you'll see today:
- Redacted personal data. Since data-protection rules like the GDPR took effect, ICANN-accredited registrars redact most personal details from public WHOIS by default. You'll still see the domain's technical and registration data, but the owner's identity is usually hidden unless they've opted to show it.
- RDAP is replacing classic WHOIS. The industry is transitioning to the Registration Data Access Protocol (RDAP), a modern, structured successor to WHOIS that returns the same information in a standardised, secure format with tiered access. For everyday lookups the experience is the same — you search a domain and read the record — but RDAP is where the data increasingly comes from.
The practical takeaway: WHOIS (and RDAP) still tell you everything you need about a domain's status, dates and registrar — just don't expect a private owner's name to be on display.
Domain privacy: why some records are hidden
If you register a domain, you may not want your name, email and phone number public for spammers and scammers to harvest. That's what domain privacy protection services do: they guard against spam and even identity theft by replacing your personal details in WHOIS with the registrar's generic contact info. At Allanux, free WHOIS privacy is included for the life of every domain, so your details stay off the public record at no extra cost. When you run a lookup and see a privacy service instead of a person, that's this protection at work.
Using WHOIS responsibly
WHOIS data is public for legitimate reasons — verifying sites, resolving disputes, fighting abuse and managing your own domains. It isn't a licence to spam or harass. ICANN's rules require accurate registration data and prohibit using WHOIS details for unsolicited marketing. If you contact an owner you found through a lookup — say, to ask about buying a name — keep it relevant and respectful.
WHOIS lookup FAQ
What is a WHOIS domain lookup? It's a search that returns a domain's public registration record — who owns it (if not hidden), when it was registered and expires, the registrar, and the nameservers.
How do I find out who owns a domain? Run a WHOIS lookup on the domain name. If the owner hasn't enabled privacy, their contact details appear in the record; if they have, you'll see the registrar's privacy placeholder instead.
Why can't I see the owner's details? Since GDPR and similar privacy rules, most personal data is redacted from public WHOIS by default, or hidden behind a domain-privacy service. The domain's technical and registration data still shows.
Does WHOIS work for .co.za domains? Yes. .co.za and other .za domains are administered by ZADNA and return the same core details, though South African registries apply their own privacy and display rules.
Can I use WHOIS to check if a domain is available? Yes — a "no match" result means the domain isn't registered and you can register it. You can't register directly through WHOIS, but you can check availability first.
What's the difference between WHOIS and RDAP? RDAP is the modern successor to WHOIS. It returns the same registration data in a standardised, secure format and is gradually replacing classic WHOIS across the industry.
Look up — and secure — your domain
A WHOIS lookup is the fastest way to see who owns a domain, when it expires and who manages it — and to confirm a .co.za name's status before you buy or transfer it. When you're ready to register a domain name of your own, register your domain in South Africa with free WHOIS privacy included, or transfer an existing domain to keep everything in one place. Not sure a name is taken? Our guide on finding and buying expired domain names shows you what to do when the domain you want is already registered.
