Autonomous system
AS51409 SIPSYNERGY
Unclassified RIPE NSP
Summary
Sipsynergy
voip sip nsp uk
SIPSYNERGY is operated by Sipsynergy Limited.
What it's used for
- The address space carries VoIP and SIP trunking infrastructure, evidenced by netnames
UK-SIPSYNERGY-20100701andUK-SIPSYNERGY-20131129. - The AS announces 3072 IPv4 addresses across 2 prefixes and maintains 72 observed neighbours, a ratio indicating a transit or network service provider role rather than a large access network.
- Traffic consists of voice signalling and media for cloud telephony and SIP trunking services provided to telecom resellers and IT partners.
Notable
- Registrants for both announced prefixes are Sipsynergy Limited, aligning with the AS holder.
- Sipsynergy and Callroute joined the 8x8 family, with Sipsynergy services transitioning to Callroute.
- The inventory consists of two distinct IPv4 blocks: 178.255.56.0/21 and 185.41.224.0/22.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| LINX LON1 | London, United Kingdom | 195.66.225.118 |
| London Network Access Point | London, United Kingdom | 5.57.81.41 |
Transit providers
19 upstream, 0 downstream and 19 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-29, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 3.07K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 2 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS51409- Registry name
- SIPSYNERGY
- Registrant
- mnt-uk-sipsynergy-1
- Abuse contact
- noc@sipsynergy.co.uk
- Registered
- 2010-08-17
- Last changed
- 2020-09-03
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- sipsynergy
- Also known as
- Hosted Network Services, sectorsix
- Network type
- NSP
- Scope
- Global
- Traffic ratio
- Balanced
- Peering policy
- Open
- IRR as-set
AS-SIPSYNERGY- Present at
- 3 exchanges
- Facilities
- 3 facilities
- Website
- http://www.sipsynergy.co.uk
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 12 valid, 0 with no ROA
- ROAs
- 18 authorising AS51409
- ASPA
- no ASPA record
- IRR
- 100% registered · 12 of 12 announcements
- Route objects
- 18 naming AS51409
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 448 networks and 1,849 prefixes, as published 2026-10-29. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere