66.115.192.0/18

Currently announced by AS13576 South Dakota Network dba SDN Communications, in the routed prefix 66.115.192.0/18.

Current ASN: AS13576; South Dakota Network dba SDN Communications
Routed prefix: 66.115.192.0/18; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 66.115.192.0/18

Routing data · Nov 2, 2026, 00:27 UTC

ASN historyEvery routed prefix covering 66.115.192.0/18

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
66.115.192.0/18	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing

More specific routes28 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
66.115.193.0/24	AS17203	Beresford Municipal Telephone Company	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.194.0/24	AS18785	Santel Communications Cooperative, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.197.0/24	AS63172	Venture Communications Cooperative	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.198.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.199.0/24	AS395037	Sammons Financial Group, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.200.0/24	AS13576	South Dakota Network dba SDN Communications	United States	2026-10-29 10:22	2026-11-02 00:27	Announcing
66.115.201.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.202.0/24	AS393417	SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.203.0/24	AS18785	Santel Communications Cooperative, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.205.0/24	AS401415	Alliance Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.206.0/24	AS401415	Alliance Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.209.0/24	AS399439	Mitchell Telecom	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.212.0/24	AS17203	Beresford Municipal Telephone Company	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.214.0/23	AS401415	Alliance Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.221.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.222.0/24	AS6312	TrioTel Communications, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.223.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.224.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.226.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.227.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.234.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.236.0/23	AS401415	Alliance Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.241.0/24	AS20014	West River Cooperative Telephone Company	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.242.0/24	AS6312	TrioTel Communications, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.246.0/24	AS19031	CU*Answers, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.248.0/22	AS399439	Mitchell Telecom	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.252.0/23	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing
66.115.254.0/24	AS13576	South Dakota Network dba SDN Communications	United States	Before monitoring	2026-11-02 00:27	Announcing

Change logAll changes

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

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RIR allocation record

Registry: ARIN
Allocated block: 66.115.192.0/18
Country: United States
Allocation date: 2002-12-20
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.