Spectrum Northeast IP Ranges
Spectrum Northeast is the part of Charter Communications that used to be Time Warner Cable's northeastern division. AS11351 still carries the ARIN handle TWC-11351-NORTHEAST, registered on 14 July 1998 and now held by Charter Communications Inc under the remark Legacy Time Warner Cable IP Assets; the same remark sits on the address blocks, one of which, 74.64.0.0/12, is still named RRNY for Road Runner New York. Charter's peering record is filed under AS20115 with the macro AS-CHTR-BB, and AS11351 has no PeeringDB entry of its own.
- Provider
- Spectrum Northeast
- Primary ASN
- AS11351
- Category
- ISP
- Headquarters
- Stamford, CT, USA
- Announced IPv4 prefixes
- 130
- Registry
- ARIN
Known IP ranges
These prefixes are currently announced to the global routing table by AS11351 (TWC-11351-NORTHEAST - Charter Communications Inc). Prefix sets change over time - use WHOIS Lookup for the authoritative record on any specific address.
74.76.0.0/14
98.2.0.0/15
67.248.0.0/15
24.58.0.0/15
66.66.0.0/15
172.100.0.0/15
104.228.0.0/15
67.252.0.0/15
45.46.0.0/15
67.240.0.0/15
2603:7080::/28
2600:6001::/32
2604:6000::/32 (IPv6)
What does a Spectrum Northeast IP mean in a privacy test?
An address here is a Charter cable line in the northeastern United States, and the hostname is unusually easy to read because Charter generates one for every address: the letters syn, the zero-padded dotted quad, then a zone that classifies the address. So syn-074-076-010-020.res.spectrum.com is residential and syn-024-058-100-020.inf.spectrum.com is infrastructure. What the name never contains is a place, so a test that pins one of these addresses to a specific town is quoting a commercial database rather than Charter. Named router interfaces are the exception, and they sit inside the same aggregates as customers: 24.58.10.20 answers as int-0-0-21.wllsmebc01e.netops.charter.com. The useful reading, then, is that the zone label tells you customer or network and nothing in the naming tells you where.
What ARIN and Charter publish for this number
Charter's interconnection material is filed under its main number rather than this one. AS20115 carries the PeeringDB record, a selective policy, North American scope and the IRR macro RADB::AS-CHTR-BB, with the policy document at spectrum.com/policies/ip-interconnection; a PeeringDB query for AS11351 returns HTTP 404, so there is no record to read. The authoritative record for this ASN is therefore ARIN's: RDAP handle AS11351, name TWC-11351-NORTHEAST, registrant Charter Communications Inc under org handle CC-3517, technical and administrative role IPADD1-ARIN at PublicIPAddressing at charter.com, abuse role ABUSE19-ARIN at abuse at charter.net, registered 14 July 1998 and last changed 27 November 2018.
ARIN also states plainly what it will not give you. The IPAddressing contact's own remark says the role exists for corporate IP allocation and administration and is unable to reply to enquiries about specific address lookups or subscriber information, while the abuse remark routes every report about Charter-owned space to one mailbox. There is no geofeed. The network objects are coarse: the block covering 74.76.10.20 is a single DIRECT ALLOCATION, handle NET-74-64-0-0-1, running from 74.64.0.0 to 74.79.255.255 under netname RRNY and registered in March 2006, rather than a per-customer reassignment - so the smallest unit the registry describes is a multi-state aggregate, and the generated hostname is the only finer signal Charter publishes.
Reading res, biz, inf and netops in a Spectrum hostname
Charter names addresses by function, and the label after the syn- prefix is the part to read. Subscriber addresses land in res.spectrum.com: syn-074-076-010-020.res.spectrum.com and syn-067-248-010-020.res.spectrum.com come from two different aggregates of this ASN. Network-side addresses use inf.spectrum.com, as on syn-024-058-100-020.inf.spectrum.com. Business service uses biz.spectrum.com, seen on Charter space such as syn-068-114-178-020.biz.spectrum.com. Individually named routers skip the scheme entirely and use device names under netops.charter.com, of the form int-0-0-21.wllsmebc01e.netops.charter.com. That is a cleaner customer-versus-operator split than most cable networks give you.
Two limits are worth stating. The scheme is Charter-wide rather than particular to this ASN - the same syn- form appears on space announced by AS20115, which is where the biz example above lives - so the hostname identifies the company and the service class but not the region, and it is the announcing ASN that places an address in the Northeast estate. And because the name is derived from the address rather than from any record about the household, an address seen twice is evidence about a pool and not about a customer; ARIN's own contact remark rules out resolving it any further, which leaves the abuse mailbox as the only route to the operator.
Related tools
Frequently asked questions
Which blocks does AS11351 announce?
The largest are in the grid above. They are legacy Time Warner Cable allocations now registered to Charter Communications Inc at ARIN, several still carrying Road Runner netnames such as RRNY on 74.64.0.0/12. There is no separately published list; the ARIN network objects and the routing table are the record.
What is the difference between res.spectrum.com and inf.spectrum.com?
They are two zones in the same generated naming scheme. An address ending in res.spectrum.com is a residential subscriber address, inf.spectrum.com marks network infrastructure, and biz.spectrum.com appears on business service. The digits in front are the address itself, zero-padded to three places.
Can I get a city from a Spectrum hostname?
No. The generated names carry no location at all, Charter publishes no geofeed for this space, and its ARIN objects describe multi-state aggregates such as 74.64.0.0 to 74.79.255.255 in one record. Named router interfaces under netops.charter.com are the only hostnames here that encode a site.
Who do I contact about an address on this network?
The abuse role ABUSE19-ARIN, which ARIN's record designates for all reports about Charter-owned space. The IPAddressing role listed as technical and administrative contact states that it cannot answer questions about specific address lookups or subscriber information, so there is no public path from an address to a household.
What does it mean if a test reports Spectrum Northeast?
An address here is a Charter cable line in the northeastern United States, and the hostname is unusually easy to read because Charter generates one for every address: the letters syn, the zero-padded dotted quad, then a zone that classifies the address. So syn-074-076-010-020.res.spectrum.com is residential and syn-024-058-100-020.inf.spectrum.com is infrastructure. What the name never contains is a place, so a test that pins one of these addresses to a specific town is quoting a commercial database rather than Charter. Named router interfaces are the exception, and they sit inside the same aggregates as customers: 24.58.10.20 answers as int-0-0-21.wllsmebc01e.netops.charter.com. The useful reading, then, is that the zone label tells you customer or network and nothing in the naming tells you where.