AS37133 Airtel Tanzania — IPv4 Prefixes

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.

55/100

Caution

How this score is built

Baseline (neutral) 65
Active-threat / abuse risk −12
Mobile allocation +2
Trust score 55 / 100

Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

⚠ 1 MOAS prefix — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS37133 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.

Prefix	Origin ASNs	Last detected (UTC)
196.13.105.0/24	AS37133, AS327912	2026-09-10 11:25:44

Network profile

Source: PeeringDB →

Network type Cable/DSL/ISP

Geographic scope Global

Traffic ratio Balanced

Peering policy Open

Present at 1 internet exchange: TIX Tanzania - Dar es Salaam

Website ↗

Top CIDR ranges

CIDR	IPs	PTR Density	Organization	Country	State	City
156.158.0.0/17	32.8K	0.0%	airtel-tz-as	TZ	—	—
156.156.128.0/19	8.2K	0.0%	airtel-tz-as	TZ	—	—
41.75.208.0/20	4.1K	18.7%	airtel-tz-as	TZ	Dar es Salaam Region	Dar es Salaam
197.186.32.0/20	4.1K	99.9%	Airtel Tanzania	TZ	Arusha	Arusha
197.186.64.0/20	4.1K	100.0%	airtel-tz-as	TZ	Dar es Salaam Region	Dar es Salaam
197.186.0.0/21	2.0K	99.9%	airtel-tz-as	TZ	—	—
197.186.40.0/21	2.0K	100.0%	airtel-tz-as	TZ	—	—
197.186.56.0/21	2.0K	100.0%	airtel-tz-as	TZ	—	—
197.186.16.0/22	1.0K	100.0%	airtel-tz-as	TZ	—	—
197.186.28.0/22	1.0K	99.9%	airtel-tz-as	TZ	—	—
197.186.32.0/22	1.0K	99.9%	airtel-tz-as	TZ	—	—
197.186.52.0/22	1.0K	100.0%	airtel-tz-as	TZ	—	—
156.156.68.0/23	512	0.0%	airtel-tz-as	TZ	—	—
196.46.122.0/23	512	0.0%	airtel-tz-as	TZ	—	—
197.186.8.0/23	512	100.0%	airtel-tz-as	TZ	—	—
197.186.26.0/23	512	100.0%	airtel-tz-as	TZ	—	—
197.186.38.0/23	512	99.8%	airtel-tz-as	TZ	—	—
102.212.83.0/24	256	0.0%	Airtel Tanzania	TZ	—	—
156.156.66.0/24	256	0.0%	airtel-tz-as	TZ	—	—
156.156.70.0/24	256	0.0%	Airtel Tanzania	TZ	—	—
156.156.94.0/24	256	0.0%	Airtel Tanzania	TZ	—	—
196.46.121.0/24	256	0.0%	airtel-tz-as	TZ	—	—
196.46.122.0/24	256	0.0%	Airtel Tanzania	TZ	—	—
197.186.10.0/24	256	100.0%	airtel-tz-as	TZ	—	—
197.186.15.0/24	256	100.0%	airtel-tz-as	TZ	—	—
197.186.25.0/24	256	100.0%	airtel-tz-as	TZ	—	—
197.186.37.0/24	256	100.0%	airtel-tz-as	TZ	—	—
197.186.48.0/24	256	100.0%	airtel-tz-as	TZ	—	—
197.186.80.0/24	256	100.0%	airtel-tz-as	TZ	—	—

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS37133 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

Prefix	Announcement samples	Last seen
197.186.36.0/24	80,837	2026-08-21 00:31:06
41.75.219.0/24	26,780	2026-09-10 15:10:06
41.75.218.0/24	25,536	2026-09-10 15:10:43
197.186.2.0/24	24,154	2026-09-10 15:10:10
197.186.0.0/24	24,003	2026-09-10 15:10:10
41.75.214.0/23	23,023	2026-09-10 15:10:50
197.186.10.0/24	22,907	2026-09-10 15:10:06
41.75.208.0/20	22,689	2026-09-10 15:10:45
41.75.220.0/22	22,552	2026-09-10 15:10:30
196.46.122.0/24	22,398	2026-09-10 15:07:43
197.186.16.0/24	21,523	2026-09-10 15:10:06
197.186.18.0/24	21,513	2026-09-10 15:10:06
197.186.32.0/24	21,487	2026-09-10 15:10:06
197.186.15.0/24	21,471	2026-09-10 15:10:06
197.186.17.0/24	21,465	2026-09-10 15:10:06
197.186.19.0/24	21,452	2026-09-10 15:10:06
197.186.3.0/24	21,417	2026-09-10 15:10:06
197.186.1.0/24	21,412	2026-09-10 15:10:06
197.186.4.0/24	21,405	2026-09-10 15:10:06
41.75.210.0/23	21,340	2026-09-10 15:10:50
41.75.208.0/23	21,336	2026-09-10 15:10:50
41.75.212.0/23	21,212	2026-09-10 15:10:50
156.156.68.0/23	20,713	2026-09-10 15:10:45
41.75.216.0/22	19,945	2026-09-10 15:10:56
156.156.128.0/19	14,645	2026-09-10 15:10:10
41.75.222.0/24	13,987	2026-09-10 15:10:30
156.156.66.0/24	13,802	2026-09-10 15:10:30
41.75.217.0/24	13,780	2026-09-10 15:10:43
197.186.62.0/24	13,500	2026-09-10 15:07:43
197.186.64.0/24	13,422	2026-09-10 15:07:43
197.186.63.0/24	13,417	2026-09-10 15:07:43
197.186.52.0/24	13,328	2026-09-10 15:07:43
197.186.59.0/24	13,318	2026-09-10 15:07:43
197.186.55.0/24	13,291	2026-09-10 15:07:43
197.186.65.0/24	13,254	2026-09-10 15:07:43
197.186.60.0/24	13,239	2026-09-10 15:07:43
197.186.45.0/24	13,225	2026-09-10 15:07:43
197.186.61.0/24	13,220	2026-09-10 15:07:43
197.186.53.0/24	13,220	2026-09-10 15:07:43
197.186.37.0/24	13,219	2026-09-10 15:07:43
197.186.58.0/24	13,217	2026-09-10 15:07:43
197.186.43.0/24	13,203	2026-09-10 15:07:43
197.186.46.0/24	13,201	2026-09-10 15:07:43
197.186.40.0/24	13,200	2026-09-10 15:07:43
197.186.54.0/24	13,191	2026-09-10 15:07:43
197.186.38.0/24	13,188	2026-09-10 15:07:43
197.186.48.0/24	13,158	2026-09-10 15:07:43
197.186.56.0/24	13,144	2026-09-10 15:07:43
197.186.57.0/24	13,142	2026-09-10 15:07:43
197.186.44.0/24	13,096	2026-09-10 15:07:43

Showing top 50 of 97 announced prefixes by sample volume.

Frequently Asked Questions

What is AS37133?

AS37133 is an Autonomous System Number assigned to Airtel Tanzania. 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 AS37133 announce?

AS37133 announces 65.0K IPv4 addresses distributed across 29 routed CIDR prefixes. The network is registered in Tanzania.

Who operates AS37133?

AS37133 is operated by Airtel Tanzania. The organization is based in Tanzania. You can view all IP ranges and related ASNs on the organization page.

What country is AS37133 registered in?

AS37133 is registered in Tanzania. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.