70.39.200.0/21

Currently announced jointly by AS979 NETLAB-SDN, AS3257 GTT Communications (AS3257), in the routed prefix 70.39.200.0/21.

Current ASN: AS979 AS3257; NETLAB-SDN
Routed prefix: 70.39.200.0/21; Most specific route covering this prefix
ASNs over time: 2; 3 announcement records
RIR allocation: ARIN; United States · 70.39.128.0/17

Routing data · Nov 8, 2026, 10:26 UTC

ASN historyEvery routed prefix covering 70.39.200.0/21

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
70.39.200.0/21	AS979	NETLAB-SDN	United States	2026-11-05 10:19	2026-11-08 10:26	Announcing
70.39.200.0/21	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.128.0/17	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-08 10:26	Announcing

More specific routes20 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
70.39.200.0/22	AS1014	Japan Networks	United States	2026-11-05 10:19	2026-11-08 10:26	Announcing
70.39.200.0/22	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.200.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.201.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.202.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.203.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.204.0/22	AS1014	Japan Networks	United States	2026-11-05 10:19	2026-11-08 10:26	Announcing
70.39.204.0/22	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.204.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.205.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.206.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.207.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-08 10:26	Announcing
70.39.200.0/24	AS1014	Japan Networks	United States	2026-10-22 06:20	2026-10-22 08:21	Stopped
70.39.201.0/24	AS1014	Japan Networks	United States	2026-10-22 06:20	2026-10-22 08:21	Stopped
70.39.202.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-05 08:22	Stopped
70.39.203.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-05 08:22	Stopped
70.39.204.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-05 08:22	Stopped
70.39.205.0/24	AS1014	Japan Networks	United States	2026-10-22 06:20	2026-10-22 08:21	Stopped
70.39.206.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-05 08:22	Stopped
70.39.207.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-05 08:22	Stopped

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-11-05 10:19	70.39.200.0/21	Origin added	AS979	NETLAB-SDN	AS3257	United States

Look up another address

RIR allocation record

Registry: ARIN
Allocated block: 70.39.128.0/17
Country: United States
Allocation date: 2009-11-24
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.