Keep subscriber ID and mobile numbers inside your office network
VoIP, hosted PBX and dialler providers run support and provisioning desks full of SA ID numbers, mobile numbers and debit-order details. ZDNS checks every lookup from your support and admin networks from one router setting, and never touches voice traffic.
Support & billing desks covered
Point your office networks at ZDNS and every lookup is checked for SA ID numbers, mobile numbers, card numbers and scrambled data.
Fake RICA & porting links blocked
Support staff handle SIM-swap and RICA requests all day; ZDNS blocks links on Google's phishing and malware lists before they load.
Voice traffic untouched
ZDNS only answers DNS lookups. SIP, RTP and dialler traffic never pass through it, and there is no software on agent PCs. Offices are recognised by their fixed public IP address.
How it plays out
A hosted VoIP provider's support desk. Illustrative, not a real customer.
- 1
A support agent's PC is compromised through a fake software update.
- 2
Malware starts sending subscriber mobile numbers out inside DNS lookups.
- 3
ZDNS recognises SA mobile numbers in the names and blocks them.
- 4
The block shows on the dashboard so the support team can isolate the PC.
Repeats about every 5 minutes · Find this computer →
Long numbers are masked to their last 4 digits before anything is stored.
Good to know
ZDNS checks every lookup for subscriber ID numbers and mobile numbers, plus scrambled codes that malware uses to smuggle data. Here is what to expect.
Fixed addresses only
ZDNS identifies each office by its public internet address. It suits business connections with a fixed address, not home users behind shared (CGNAT) addresses.
Pricing
R50 a seat a month, from 25 seats, with no long-term contract. Want to offer ZDNS to your own call-centre clients? See the page for IT providers.
Nothing is blocked in week one
Every customer starts in shadow mode for about a week, sees what would be blocked, and whitelists anything they rely on before blocking starts.
Keep subscriber ID and mobile numbers where they belong
R50 a seat a month, from 25 seats. One router setting. Protected in shadow mode from day one.