$ query “AS37133” --type=asn → 1 result(s)

AS37133 · ZAIN-TANZANIA-AS

Zain Tanzania AS

AS37133 belongs to Zain Tanzania AS and is a mid-size transit provider, established in Tanzania in 2009. The system announces a respectable 64 768 IPv4 addresses, and supports IPv6. Most of its address space is geolocated to Tanzania. Prefix announcements for this AS were recently updated.

  • #4 in Tanzania — Top 10 by reach within country

Basic Information

Country
🇹🇿 Tanzania
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
November 09, 2009
Last Changed
May 10, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
92 / 22
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
64 768
Largest IPv4 Prefix
/17 (32 768 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇹🇿 Tanzania (69 376 IPs)
Prefix Changed
June 17, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
3 upstreams providing transit
Peers
4 networks exchanging traffic without transit
Downstream Customers
13 downstreams buying transit
Unclassified
4 unclassified BGP neighbors
Degree
24 unique BGP neighbors
Reach
34 networks in customer cone

Upstream Providers (3)

Prefix Lists

IPv4 Prefixes (92 total)

  • 156.158.0.0/17 (32 768 addresses (/17 prefix))
  • 156.156.128.0/19 (8 192 addresses (/19 prefix))
  • 197.186.64.0/20 (4 096 addresses (/20 prefix))
  • 197.186.32.0/20 (4 096 addresses (/20 prefix))
  • 41.75.208.0/20 (4 096 addresses (/20 prefix))
  • 197.186.0.0/21 (2 048 addresses (/21 prefix))
  • 197.186.56.0/21 (2 048 addresses (/21 prefix))
  • 197.186.28.0/22 (1 024 addresses (/22 prefix))
  • 197.186.16.0/22 (1 024 addresses (/22 prefix))
  • 197.186.52.0/22 (1 024 addresses (/22 prefix))
  • 156.156.68.0/23 (512 addresses (/23 prefix))
  • 197.186.8.0/23 (512 addresses (/23 prefix))
  • 102.212.82.0/23 (512 addresses (/23 prefix))
  • 196.46.122.0/23 (512 addresses (/23 prefix))
  • 197.186.26.0/23 (512 addresses (/23 prefix))
  • 197.186.15.0/24 (256 addresses (/24 prefix))
  • 196.46.121.0/24 (256 addresses (/24 prefix))
  • 197.186.48.0/24 (256 addresses (/24 prefix))
  • 197.186.25.0/24 (256 addresses (/24 prefix))
  • 156.156.66.0/24 (256 addresses (/24 prefix))
  • 197.186.10.0/24 (256 addresses (/24 prefix))
  • 197.186.80.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (1 total)

  • 2c0f:f2f8::/32