123.51.0.0/17

Currently announced by AS38333 Symbio Networks, in the routed prefix 123.51.0.0/17.

Current ASN: AS38333; Symbio Networks
Routed prefix: 123.51.0.0/17; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: APNIC; Australia · 123.51.0.0/17

Routing data · Nov 8, 2026, 10:26 UTC

ASN historyEvery routed prefix covering 123.51.0.0/17

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
123.51.0.0/17	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-08 10:26	Announcing

More specific routes50 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
123.51.0.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.1.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.2.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.2.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.4.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.8.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.12.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.12.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.14.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.16.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.20.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.22.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.24.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.28.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.34.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.36.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.40.0/21	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.48.0/21	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.48.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.49.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.50.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.50.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.51.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.52.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.52.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.53.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.54.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.54.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.55.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.62.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.64.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.65.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.68.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.68.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.69.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.70.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.71.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.72.0/21	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.74.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.76.0/22	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.105.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.107.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.108.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.110.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.110.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.116.0/23	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.117.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.120.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.122.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped
123.51.123.0/24	AS38333	Symbio Networks	Australia	Before monitoring	2026-11-05 16:24	Stopped

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

Look up another address

RIR allocation record

Registry: APNIC
Allocated block: 123.51.0.0/17
Country: Australia
Allocation date: 2006-11-20
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.