Event Monitor Cyber
EM-20261105-EI9B OutageHigh severity

AT&T: Network Connectivity Drop

Nov 4, 2026 · Carrier · reported by IODA (Georgia Tech), Bandwidth

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Providers' own notes put the impact at 13:40–01:00 UTC on Nov 4.

Status
Confirmed

Since : 1 provider status page acknowledged it.

First Signal
Nov 04 17:40 UTCC111 IODA (Georgia Tech)
Page Born
Nov 05 12:28 UTCsecond source joined
Last Signal
Nov 05 12:28 UTC2 hours before snapshot
Sources
21 official · 1 research, news or crowd
Lasted
19 hoursso far

Life Of This Page

  1. 1
    Born
    A second, independent provider or measurement sees it.
  2. 2
    Developing
    Reports and measurements join.
  3. 3
    Confirmed · Now
    A provider status page acknowledges it.
  4. 4
    Resolved
    Not yet
    Every provider marks it resolved and 6 hours pass quietly, or 24 hours pass with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The ID never changes, and earlier addresses keep working. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Outage Lifecycle

  1. First Report: reached
    Nov 04 17:40 UTC
    C111 IODA (Georgia Tech)
  2. Corroborated: reached
    Nov 05 12:28 UTC
    2 independent sources
  3. Acknowledged: reached
    Nov 05 12:28 UTC
    T18 status page
  4. Network Check: reached
    Nov 04 17:40 UTC
    C111 IODA: network normal (lowest 99%)
  5. Restored: not yet
    Not yet
    Still open

Timeline

12:0018:00Nov 506:0012:0018:00BornC111 IODA (Georgia Tech)T18 Bandwidth status

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

AT&T Network During The Incident

0%50%100%Nov 3 16hNov 4 04hNov 4 16hNov 5 04h

Solid blue line: routes announced. Dashed amber line: networks answering pings. Both as a share of AT&T's normal, from C111 IODA, lowest reading in each 2 hours; the shaded band is the incident. The network itself stayed at normal (lowest 99%): the problem was in the service, not the network.

Signals

  1. Bandwidth: Outbound 10DLC MMS Delivery Incident - T-Mobile, Verizon, AT&T (opens source in a new tab) postmortem. Between 13:40 UTC on November 3 and 01:00 UTC November 4, customers encountered intermittent disruption in the form of delays and expired messages for the following message types: * Outbound 10DLC MMS to Veri… High severityProvider StatusT18 Bandwidth status
  2. Connectivity drop: AS19957 (TENNESSEE-NET) (AT&T Enterprises, LLC) (opens source in a new tab) 1 IODA alerts in 6 hours (0 critical), signals: bgp. Entity type: asn. Med severityMeasurementC111 IODA (Georgia Tech)
  3. Connectivity drop: TENNESSEE-NET -- United States (AT&T Corp.) (opens source in a new tab) 1 IODA alerts in 6 hours (0 critical), signals: bgp. Entity type: geoasn. Med severityMeasurementC111 IODA (Georgia Tech)
  4. Connectivity drop: TENNESSEE-NET -- United States (AT&T Corp.) (opens source in a new tab) 1 IODA alerts in 6 hours (1 critical), signals: bgp. Entity type: geoasn. Med severityMeasurementC111 IODA (Georgia Tech)
  5. Connectivity drop: AS19957 (TENNESSEE-NET) (AT&T Enterprises, LLC) (opens source in a new tab) 1 IODA alerts in 6 hours (1 critical), signals: bgp. Entity type: asn. Med severityMeasurementC111 IODA (Georgia Tech)
  6. Connectivity drop: PBI-NET-BLK2 -- California (AT&T Corp.) (opens source in a new tab) 1 IODA alerts in 6 hours (0 critical), signals: bgp. Entity type: geoasn. Med severityMeasurementC111 IODA (Georgia Tech)