AS28209 — AS28209 - Under Servicos de Internet Ltda

Network type: hosting

AS28209 announces 3 IPv4 prefixes covering 20,480 addresses and 2 IPv6 prefixes.

About this network

AS28209 is operated by Under, a Brazilian internet service provider.

What it's used for

• The address space carries residential and business broadband traffic, evidenced by reverse DNS entries such as none.underplatform.com and f1215abf95.underplatform.com.
• The AS announces 20,480 IPv4 addresses across 19 prefixes and 8 IPv6 prefixes, while maintaining 33 observed neighbours; this ratio of moderate address space to a significant number of peering partners suggests a regional access network with substantial transit and peering relationships.

Notable

• All registrants in the RDAP data match the announcer, consistently listing Under Servicos de Internet Ltda for netnames 212854, 167887, and 113587.
• The address inventory is finely subdivided into /21, /22, /23, and /24 blocks across the 177.70.0.0/16, 179.127.0.0/16, and 189.113.0.0/16 ranges, indicating site-by-site segmentation typical of a large ISP managing distinct customer pools or regional hubs.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 177.70.0.0/19
• 179.127.0.0/19
• 189.113.0.0/20
• 2804:d4::/36
• 2804:1070::/32

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS22381 SAMM TECNOLOGIA E TELECOMUNICACOES S.A
• AS264409 Huge Solucoes Corporativas Ltda
• AS6939 Hurricane Electric LLC
• AS24482 SG.GS
• AS37721 Virtual Technologies & Solutions
• AS35280 F5 Networks SARL

Downstream networks

• AS28138 WN INTERNET
• AS26615 TIM S/A
• AS265380 WSU Tecnologia Ltda

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS22381 SAMM TECNOLOGIA E TELECOMUNICACOES S.A
• AS264409 Huge Solucoes Corporativas Ltda
• AS6939 Hurricane Electric LLC
• AS28138 WN INTERNET
• AS26615 TIM S/A
• AS265380 WSU Tecnologia Ltda
• AS24482 SG.GS
• AS37721 Virtual Technologies & Solutions
• AS35280 F5 Networks SARL

Routing security

• RPKI: 50 valid, 0 invalid and 2 not-found announcements; 4 ROAs.
• ASPA: none published.
• IRR: 21% of announcements registered; 24 route objects.
• Listed in as-sets: AS-CTBC-CUSTOMERS103, AS-CTBC-CUSTOMERS23, AS-CTBC-TOOLS-1, AS-DURAND1-CUSTOMER, AS-E1-AUTOMATION-CUSTOMER, AS-HUGENET-CUSTOMERS, AS-MEGATELECOM-CUSTOMERS, AS-SAMM, AS-STORMWALL-SET, AS-STORMWALL-SET, AS-TASCOM-CUSTOMERS, AS-UFINET-LATAM-BRASIL, AS-UNDER, AS263444:AS-SAMM, AS264409:AS-CONE, AS3491:AS-CUSTOMERS-NA, AS52925:AS-CONE, AS53013:AS-CONE.

Internet exchanges

• IX.br (PTT.br) São Paulo — São Paulo, Brazil