Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS18596

Announcement observedARIN

Madison Telephone Company · MADISONTELCO

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active9/30/2026, 22:39:08Snapshot expired

View network topology RDAP registration

ASN: AS18596
Registration country: United States
Name: Madison Telephone Company
Abbreviation: MADISONTELCO
Registration date: 9/18/2000, 04:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
66.242.192.0/19BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
66.242.192.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
66.242.208.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
66.242.214.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
66.242.221.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
76.77.224.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
76.77.232.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record
76.77.236.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/16/2026, 16:00:00	9/30/2026, 16:00:00	✓	×	Historical record

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: Madison Telephone Company
RIR: ARIN
Registration country: United States
Registration date: 9/18/2000, 04:00:00
Abuse contact: abuse@madisontelco.com

Snapshot trend

9/30/2026, 22:39:088 v41 v62 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · iana-rdap-asn-bootstrap · rir-rdap-asn