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.
- Baseline (neutral) 65
- Active-threat / abuse risk −12
- Mobile allocation +2
- Trust score 55 / 100
Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →
⚠ 27 MOAS prefixes — 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) |
|---|---|---|
| 197.158.244.0/23 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.252.0/23 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.245.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.254.0/23 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 41.79.60.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 41.79.60.0/23 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 41.79.62.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 41.79.63.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.225.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.247.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.253.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 41.79.61.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.255.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.244.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
| 197.158.246.0/24 | AS37133, AS37343 | 2026-11-13 12:09:09 |
Showing the 15 most recently detected of 27 MOAS prefixes. Many multi-origin prefixes on large networks are benign (anycast); see all MOAS anomalies.
Network profile
Source: PeeringDB →Present at 1 internet exchange: TIX Tanzania - Dar es Salaam
Top CIDR ranges
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 |
| 197.186.2.0/24 | 59,527 | 2026-11-13 11:37:23 |
| 197.186.0.0/24 | 58,602 | 2026-11-13 11:37:23 |
| 41.75.218.0/24 | 45,307 | 2026-11-13 11:37:23 |
| 197.186.16.0/24 | 43,321 | 2026-11-13 09:19:19 |
| 197.186.18.0/24 | 43,094 | 2026-11-13 09:19:19 |
| 197.186.17.0/24 | 43,040 | 2026-11-13 09:19:19 |
| 197.186.15.0/24 | 43,035 | 2026-11-13 09:19:19 |
| 197.186.19.0/24 | 43,016 | 2026-11-13 09:19:19 |
| 197.186.4.0/24 | 42,983 | 2026-11-13 09:19:19 |
| 197.186.3.0/24 | 42,982 | 2026-11-13 09:19:19 |
| 197.186.1.0/24 | 42,962 | 2026-11-13 09:19:19 |
| 197.186.32.0/24 | 42,835 | 2026-11-13 09:19:19 |
| 196.46.122.0/24 | 42,225 | 2026-11-13 11:37:23 |
| 41.75.220.0/22 | 41,722 | 2026-11-13 11:37:23 |
| 197.186.5.0/24 | 40,300 | 2026-11-13 11:37:23 |
| 197.186.80.0/24 | 39,950 | 2026-11-13 11:37:23 |
| 41.75.208.0/23 | 39,850 | 2026-11-13 11:37:23 |
| 41.75.210.0/23 | 39,828 | 2026-11-13 11:37:23 |
| 41.75.214.0/23 | 39,727 | 2026-11-13 11:37:23 |
| 41.75.212.0/23 | 39,716 | 2026-11-13 11:37:23 |
| 197.186.10.0/24 | 39,142 | 2026-11-13 09:19:19 |
| 197.186.28.0/22 | 37,193 | 2026-11-13 11:37:50 |
| 41.75.220.0/24 | 36,627 | 2026-11-13 11:37:23 |
| 197.186.26.0/23 | 35,411 | 2026-11-13 11:37:50 |
| 197.186.68.0/22 | 35,262 | 2026-11-13 11:37:50 |
| 197.186.66.0/23 | 35,247 | 2026-11-13 11:37:50 |
| 197.186.6.0/23 | 35,232 | 2026-11-13 11:37:50 |
| 197.186.72.0/21 | 35,196 | 2026-11-13 11:37:50 |
| 197.186.8.0/23 | 35,146 | 2026-11-13 11:37:50 |
| 41.75.222.0/24 | 34,614 | 2026-11-13 00:08:55 |
| 156.156.128.0/19 | 34,509 | 2026-11-13 11:37:23 |
| 41.75.208.0/20 | 33,546 | 2026-11-13 11:58:29 |
| 41.75.219.0/24 | 33,246 | 2026-11-13 09:19:19 |
| 197.186.62.0/24 | 31,211 | 2026-11-13 11:37:23 |
| 197.186.63.0/24 | 31,099 | 2026-11-13 11:37:23 |
| 197.186.64.0/24 | 30,988 | 2026-11-13 11:37:23 |
| 197.186.59.0/24 | 30,798 | 2026-11-13 11:37:23 |
| 197.186.65.0/24 | 30,755 | 2026-11-13 11:37:23 |
| 197.186.52.0/24 | 30,750 | 2026-11-13 11:37:23 |
| 197.186.55.0/24 | 30,739 | 2026-11-13 11:37:23 |
| 197.186.60.0/24 | 30,715 | 2026-11-13 11:37:23 |
| 197.186.61.0/24 | 30,701 | 2026-11-13 11:37:23 |
| 197.186.58.0/24 | 30,698 | 2026-11-13 11:37:23 |
| 197.186.54.0/24 | 30,654 | 2026-11-13 11:37:23 |
| 197.186.45.0/24 | 30,613 | 2026-11-13 11:37:23 |
| 197.186.53.0/24 | 30,600 | 2026-11-13 11:37:23 |
| 197.186.46.0/24 | 30,593 | 2026-11-13 11:37:23 |
| 197.186.37.0/24 | 30,587 | 2026-11-13 11:37:23 |
| 197.186.57.0/24 | 30,586 | 2026-11-13 11:37:23 |
Showing top 50 of 132 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 64.8K IPv4 addresses distributed across 23 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.
