AS12687 — URAN Kiev, Ukraine

AS12687 announces 10 IPv4 prefixes covering 3,584 addresses and 15 IPv6 prefixes.

About this network

Ukraine's research network, whose reverse DNS labels which addresses are network and broadcast addresses.

What it's used for

• The national research and academic network. 3,584 addresses in ten IPv4 prefixes, sixteen IPv6 prefixes, and 34 observed BGP neighbours.

Notable

• Most blocks share the netname UA-URAN-990525, dated May 1999.
• Two are named for what they carry: URAN-REGIONS-NET and URAN-POLTAVA-NET.
• 212.111.201.0/24 is registered to Infonet-Telecom, a separate holder.
• The IPv6 announcements form a doubling ladder: a /48, two /47s, then a /45, /44, /43, /42, /41, /40 and /39.
• Two sampled addresses answered, as netaddr-192-128.reverse.uran.ua and braddr-192-255.reverse.uran.ua.

Interesting

• netaddr and braddr are the network and broadcast addresses of a subnet, the first and last of the range, neither of which can be assigned to a machine. Naming them publishes the internal subnetting plan: .128 being a network address means the /24 is cut into halves, and anyone reading the reverse zone can map the boundaries without touching the network.
• That doubling ladder of IPv6 prefixes is what happens when a range that is not a single power-of-two block gets expressed in CIDR. Each successive prefix is twice the last, filling the range greedily from the bottom up, and the gaps in the sequence mark the pieces held back.
• Announcing sixteen IPv6 prefixes against ten IPv4 ones is an inversion of the usual ratio. Research networks ran IPv6 in production while commercial providers were still describing it as a future concern, and the shape of the announcements still shows it.

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

Announced prefixes

• 212.111.192.0/23
• 212.111.195.0/24
• 212.111.196.0/23
• 212.111.198.0/24
• 212.111.201.0/24
• 212.111.202.0/23
• 212.111.206.0/24
• 212.111.208.0/24
• 212.111.210.0/24
• 212.111.212.0/23
• 2a01:5c40::/46
• 2a01:5c40:4::/47
• 2a01:5c40:8::/45
• 2a01:5c40:10::/44
• 2a01:5c40:20::/43
• 2a01:5c40:40::/42
• 2a01:5c40:80::/41
• 2a01:5c40:100::/40
• 2a01:5c40:200::/39
• 2a01:5c40:400::/38
• 2a01:5c40:800::/37
• 2a01:5c40:1000::/36
• 2a01:5c40:2000::/35
• 2a01:5c40:4000::/34
• 2a01:5c40:8000::/33

Upstream networks

• AS9002 RETN Limited
• AS21320 GEANT Vereniging
• AS6939 Hurricane Electric LLC
• AS20965 GEANT Vereniging
• AS9199 RENAM Public Association
• AS24482 SG.GS
• AS57463 NetIX Communications JSC
• AS3326 PRIVATE JOINT STOCK COMPANY "DATAGROUP"
• AS211509 Rudakov Ihor

Downstream networks

• AS3319 User Association of Ukrainian Research and Academic Network URAN
• AS25500 User Association of Ukrainian Research and Academic Network URAN
• AS34776 State Non-Commercial Company STATE UNIVERSITY "KYIV AVIATION INSTITUTE"
• AS13032 Kyiv National Taras Shevchenko University
• AS212397 User Association of Ukrainian Research and Academic Network URAN
• AS31206 National University Of Food Technologies
• AS47306 The International Scientifical and Educational Centre of Informational Technologies and Systems of National Academy of Sciences of Ukraine and Ministry Education of Ukraine
• AS29599 "Zaporizhzhia Polytechnic" National university
• AS205656 User Association of Ukrainian Research and Academic Network URAN
• AS204879 Academy of Education and Business Development Ltd.
• AS29574 Vinnytsia National Technical University
• AS51652 National University of Life and Environmental Sciences of Ukraine
• AS51500 Servisnet Ltd.
• AS9199 RENAM Public Association
• AS201865 Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine

Adjacent networks

• AS9002 RETN Limited
• AS3319 User Association of Ukrainian Research and Academic Network URAN
• AS6939 Hurricane Electric LLC
• AS25500 User Association of Ukrainian Research and Academic Network URAN
• AS21320 GEANT Vereniging
• AS20965 GEANT Vereniging
• AS13032 Kyiv National Taras Shevchenko University
• AS34776 State Non-Commercial Company STATE UNIVERSITY "KYIV AVIATION INSTITUTE"
• AS212397 User Association of Ukrainian Research and Academic Network URAN
• AS31206 National University Of Food Technologies
• AS47306 The International Scientifical and Educational Centre of Informational Technologies and Systems of National Academy of Sciences of Ukraine and Ministry Education of Ukraine
• AS29599 "Zaporizhzhia Polytechnic" National university
• AS205656 User Association of Ukrainian Research and Academic Network URAN
• AS204879 Academy of Education and Business Development Ltd.
• AS29574 Vinnytsia National Technical University
• AS9199 RENAM Public Association
• AS51652 National University of Life and Environmental Sciences of Ukraine
• AS3326 PRIVATE JOINT STOCK COMPANY "DATAGROUP"
• AS51500 Servisnet Ltd.
• AS24482 SG.GS
• AS201865 Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
• AS57463 NetIX Communications JSC
• AS211509 Rudakov Ihor

Internet exchanges

• RUDAKI-IX — Kiev, Ukraine