Home ASN LookupAS51859

AS51859 MNSHA-AS Mainstream doo Beograd

🇷🇸

Org handle: ORG-CD2-RIPE

RIPE NCCallocated

Announced Prefixes (BGP)

38total

35 IPv43 IPv6

IPv4 Addresses

Allocated (RIR)16,896

Announced (BGP)19,456

IPv6 Addresses

Allocated (RIR)6.3×10²⁹

Announced (BGP)6.7×10²⁹

Prefix Limit (IPv4)

100

Prefix Limit (IPv6)

Country

🇷🇸 RS

RIR

RIPE NCC

Status

allocated

Allocated

2010-11-17

Announced Prefixes

(BGP)38

Prefix	RPKI	IRR	Last Seen
87.237.200.0/21	Valid	RIPE	2026-10-11
87.237.201.0/24	Valid	RIPE	2026-10-11
87.237.202.0/24	Valid	RIPE	2026-10-11
87.237.203.0/24	Valid	RIPE	2026-10-11
87.237.204.0/24	Valid	RIPE	2026-10-11
87.237.205.0/24	Valid	RIPE	2026-10-11
87.237.206.0/24	Valid	RIPE	2026-10-11
87.237.207.0/24	Valid	RIPE	2026-10-11
91.185.199.0/24	Valid	RIPE	2026-10-11
91.185.218.0/23	Valid	RIPE	2026-10-11

1-10 of 38

1 / 4

Allocated Prefixes

(RIR)27

Prefix	Country	RIR	Status
87.237.200.0/21	🇷🇸 RS	RIPENCC	allocated
87.237.201.0/24	🇷🇸 RS	RIPE	assigned
87.237.203.0/24	🇷🇸 RS	RIPE	assigned
87.237.204.0/24	🇷🇸 RS	RIPE	assigned
87.237.205.0/24	🇷🇸 RS	RIPE	assigned
87.237.207.0/24	🇷🇸 RS	RIPE	assigned
91.185.199.0/24	🇸🇮 SI	RIPE	assigned
91.185.223.0/24	🇸🇮 SI	RIPE	assigned
91.214.200.0/22	🇷🇸 RS	RIPENCC	allocated
91.222.4.0/22	🇷🇸 RS	RIPENCC	assigned

1-10 of 27

1 / 3

All 38 announced prefixes of AS51859 →

BGP Neighbours

(seen in AS paths)

Upstreams (7)

Networks AS51859 hands its own prefixes to: transit providers, or peers at an exchange.

AS21215UGNI UNITED GROUP NETWORK INFRASTRUCTURE D.O.O. Beograd10
AS31042YETTEL D.O.O9
AS8400TELEKOM SRBIJA A.D6
AS8866VIVACOM Bulgaria EAD5
AS15958CETIN Doo CETIN . Belgrade4
AS3212TELEMACH Slovenija D.O.O3
AS13004SOX Serbian Open Exchange DOO1

Transfer History

Registry transfers of AS51859 between organisations.

AS51859M&A · 2017-10-03
Mainstream doo
RIPE NCC
→
Mainstream doo Beograd
RIPE NCC

Date	Resource	From	To	Type
2017-10-03	AS51859	Mainstream doo RIPE NCC	Mainstream doo Beograd RIPE NCC	M&A

ASPA

No ASPA

Abuse Contact

External Links

RIPE Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS51859 should publish an ASPA object
IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/51859

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/51859" | jq