subnet.im

AS37027Simbanet (T) Limited

TanzaniaRegistryAFRINICTypeEyeball

As of 23rd October 2026, AS37027 (Simbanet (T) Limited), an access network registered in Tanzania with AFRINIC, originates 55 IPv4 prefixes covering 23k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 6,524th-largest of the 79,666 networks we see originating IPv4, and the 9th-largest of 104 in Tanzania. It is seen behind 3 upstream networks, most often AS15399 (Wananchi Group (Kenya) Limited) and AS37100 (SEACOM Limited), and in front of 17 downstream networks. 3% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 83% of its routes reach at least 90% of full-feed peers, and 10 prefixes are also originated by another network.

At a glance

IPv4 prefixes

55

IPv6 prefixes

3

IPv4 addresses

23k

IPv6 /64s

12.9B

Upstream graph

The networks AS37027 is seen behind, one and two hops out, drawn from real AS paths.

AS37027Toward the internet core
Upstream graph for AS37027: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS37027Simbanet (T) Limi…This networkAS15399Wananchi Group (K…AS37100SEACOM LimitedAS37662West Indian Ocean…AS37271Workonline Commun…AS2914NTT America, Inc.AS6453TATA Communicatio…AS174Cogent Communicat…AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS37027 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

39

adjacent networks

Upstreams
38%
Peers
1949%
Downstreams
1744%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS37027
NetworkCountryRelationshipPathsVantage pts
AS15399Wananchi Group (Kenya) LimitedKEPeer3,337141
AS37100SEACOM LimitedMUPeer3,14977
AS37662West Indian Ocean Cable Company (WIOCC)MUPeer2,14577

Prefixes

All 58

The largest blocks AS37027 originates, widest first.

Largest prefixes originated by AS37027
PrefixAddressesVisibility
45.221.72.0/212k77/77
102.36.216.0/212k77/77
102.208.68.0/221k77/77
102.209.128.0/221k59/77
102.211.60.0/221k77/77
102.215.164.0/221k45/77
102.216.148.0/221k77/77
154.66.216.0/221k77/77
102.216.150.0/2351226/77
102.219.102.0/2351277/77

Routing health

How AS37027's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid3.4%2
  • Invalid0.0%0
  • No ROA96.6%56

Propagation

  • Globally propagated90% of full-feed peers or more82.8%48
  • Partially propagated40% to 90%6.9%4
  • Seen by few peersUnder 40%10.3%6

Prefix sizes

IPv4 — 55 prefixes

IPv6 — 3 prefixes

  • /324.3B × /64100.0%3

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

  • Announced102.36.218.0/2417th Oct 2026
  • Announced102.36.221.0/2417th Oct 2026
  • Announced102.36.222.0/2417th Oct 2026
  • Withdrawn102.36.218.0/2415th Oct 2026
  • Withdrawn102.36.221.0/2415th Oct 2026
  • Withdrawn102.36.222.0/2415th Oct 2026
  • Withdrawn102.214.148.0/2230th Sept 2026
  • Withdrawn102.216.144.0/2230th Sept 2026
  • Withdrawn102.217.57.0/2430th Sept 2026
  • Withdrawn102.217.58.0/2330th Sept 2026
  • Announced102.216.149.0/2428th Sept 2026
  • Announced102.216.150.0/2328th Sept 2026

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.