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Autonomous System

AS21491

IDDQD-AS

Announced IPs
65,536
CIDR prefixes
1
ASN
AS21491

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

57/100
Caution
How this score is built
  • Baseline (neutral) 65
  • Active-threat / abuse risk −12
  • Enterprise allocation +4
  • Trust score 57 / 100

Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →

About Cable & Wireless

Cable & Wireless plc was a British telecommunications company.

Founded
1860
Headquarters
London
Industry
telecommunications
Parent
Cable & Wireless (Holding), Ltd.

⚠ 2 MOAS prefixes — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS21491 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.

PrefixOrigin ASNsLast detected (UTC)
102.220.21.0/24 AS21491, AS328904 2026-11-06 14:53:06
196.10.228.0/24 AS21491, AS37679 2026-11-06 14:53:06

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
196.0.0.0/16 65.5K
0.2%
UGANDA-TELECOM Uganda Telecom UG Central Region Kampala
102.220.21.0/24 256
0.0%
IDDQD-AS UG — —

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS21491 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
196.0.0.0/16 792,204 2026-11-06 14:48:36
196.0.104.0/24 542,510 2026-11-06 11:18:32
196.0.21.0/24 507,752 2026-11-06 14:40:29
196.0.22.0/24 507,545 2026-11-06 14:40:29
196.0.6.0/24 506,827 2026-11-06 14:40:29
196.0.7.0/24 506,494 2026-11-06 14:40:29
196.0.23.0/24 502,938 2026-11-06 14:40:29
196.0.128.0/24 252,019 2026-11-06 14:40:29
196.0.45.0/24 246,976 2026-11-06 14:40:29
196.0.54.0/24 246,490 2026-11-06 14:40:29
196.0.47.0/24 246,384 2026-11-06 14:40:29
196.0.13.0/24 244,180 2026-11-06 14:40:29
196.0.8.0/24 240,275 2026-11-06 14:40:29
196.0.69.0/24 240,200 2026-11-06 14:40:29
196.0.39.0/24 240,169 2026-11-06 14:40:29
196.0.109.0/24 238,387 2026-11-06 14:40:29
196.0.49.0/24 238,008 2026-11-06 14:40:29
196.0.42.0/24 237,937 2026-11-06 14:40:29
196.0.1.0/24 237,904 2026-11-06 14:40:29
196.0.101.0/24 237,902 2026-11-06 14:40:29
196.0.89.0/24 237,775 2026-11-06 14:40:29
196.0.5.0/24 237,771 2026-11-06 14:40:29
196.0.2.0/24 237,712 2026-11-06 14:40:29
196.0.29.0/24 237,691 2026-11-06 14:40:29
196.0.102.0/24 237,639 2026-11-06 14:40:29
196.0.27.0/24 237,614 2026-11-06 14:40:29
196.0.111.0/24 237,593 2026-11-06 14:40:29
196.0.30.0/24 237,570 2026-11-06 14:40:29
196.0.43.0/24 237,526 2026-11-06 14:40:29
196.0.110.0/24 237,524 2026-11-06 14:40:29
196.0.32.0/24 237,521 2026-11-06 14:40:29
196.0.10.0/24 237,498 2026-11-06 14:40:29
196.0.25.0/24 237,461 2026-11-06 14:40:29
196.0.26.0/24 237,435 2026-11-06 14:40:29
196.0.35.0/24 237,388 2026-11-06 14:40:29
196.0.4.0/24 237,306 2026-11-06 14:40:29
196.0.40.0/24 237,250 2026-11-06 14:40:29
196.0.36.0/24 237,042 2026-11-06 14:40:29
196.0.19.0/24 236,864 2026-11-06 14:40:29
196.0.28.0/24 236,630 2026-11-06 14:40:29
196.0.121.0/24 234,970 2026-11-06 14:40:29
196.0.50.0/24 230,294 2026-11-06 14:40:29
102.220.21.0/24 186,072 2026-11-06 05:27:26
196.0.37.0/24 159,671 2026-11-06 13:26:37
196.10.228.0/24 33,811 2026-11-06 14:39:59
196.0.58.0/24 23,233 2026-11-06 13:26:37
196.0.87.0/24 23,074 2026-11-06 13:26:37
196.0.86.0/24 22,881 2026-11-06 13:26:37
196.0.17.0/24 16,607 2026-11-06 13:26:37
196.0.119.0/24 16,560 2026-11-06 13:26:37

Showing top 50 of 68 announced prefixes by sample volume.

Frequently Asked Questions

What is AS21491?

AS21491 is an Autonomous System Number assigned to IDDQD-AS. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).

How many IP addresses does AS21491 announce?

AS21491 announces 65.5K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Uganda.

Who operates AS21491?

AS21491 is operated by IDDQD-AS. The organization is based in Uganda. You can view all IP ranges and related ASNs on the organization page.

What country is AS21491 registered in?

AS21491 is registered in Uganda. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-11-06 14:54:06 UTC
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