Many internet service providers (ISPs) use dynamic IPs. Power-cycling your router can sometimes assign you a fresh IP that isn't on the blocklist. Try Incognito Mode:

If you're looking for an alternative while the ban persists, I can recommend or help you set up a native alarm on your computer.

Onlineclock.net is but is frequently blocked by overzealous network filters (especially in schools) due to being unclassified or flagged as a "distraction." It poses no security threat. Users affected should request an unblock or switch to an offline/alternative timer. Network administrators should consider whitelisting the domain, as it serves genuine productivity use cases.

If you are unable to access the site, it is likely due to one of the following local issues rather than a global ban: School or Workplace Filters:

: Schools often use web filters to block "distracting" content. While a clock is a tool, many versions of the site have historically included features like games or video timers that can lead to off-task behavior.

Many users pivot to vclock.com or time.is , which often escape the "distraction" tags applied to older clock sites.